https://ntp.niehs.nih.gov/go/13672

TDMS Study 96018-03 Pathology Tables

NTP                                        STATISTICAL ANALYSIS OF PRIMARY TUMORS                              REPORT: PEIRPT08     
LAB: Southern Research Inst               WATER DISINFECTION BYPRODUCTS (BROMODICHLOROMETHANE)                 DATE: 04/15/03       
EXPERIMENT: 96018 TEST: 03                                                                                     TIME: 15:28:34       
TEST TYPE:  CHRONIC                             CAGES FROM 0000 TO LAST CAGE                                   PAGE:       1        
CONT: N01-ES-85420                              ROUTE: DOSED WATER                                             NTP C#: C96018       
PATHOLOGIST: FARNELL, DANIEL R.                                                                                CAS: 75-27-4         
------------------------------------------------------------------------------------------------------------------------------------
                                                            FINAL#1/RATS                                                            
               REASONS FOR REMOVAL:    ALL                                                                                          
               REMOVAL DATE RANGE:     ALL                                                                                          
               TREATMENT GROUPS:       INCLUDE ALL                                                                                  
NTP                                        STATISTICAL ANALYSIS OF PRIMARY TUMORS                              REPORT: PEIRPT08     
LAB: Southern Research Inst               WATER DISINFECTION BYPRODUCTS (BROMODICHLOROMETHANE)                 DATE: 04/15/03       
EXPERIMENT: 96018 TEST: 03                                                                                     TIME: 15:28:34       
TEST TYPE:  CHRONIC                             CAGES FROM 0000 TO LAST CAGE                                                        
CONT: N01-ES-85420                              ROUTE: DOSED WATER                                             NTP C#: C96018       
PATHOLOGIST: FARNELL, DANIEL R.                                                                                CAS: 75-27-4         
Rats(FISCHER 344)                                                                                                                   
-----------------------------                                                                                                       
FOR ALL DOSES THE TUMOR RATES IN THE FOLLOWING TISSUES/ORGANS ARE                                                                   
BASED ON NUMBER OF TISSUES EXAMINED.  IN OTHER TISSUES/ORGANS RATES                                                                 
ARE BASED ON THE NUMBER OF ANIMALS NECROPSIED.                                                                                      
                                                 ---------------                                                                    
                                                 Adrenal Cortex                                                                     
                                                 Adrenal Medulla                                                                    
                                                 Brain                                                                              
                                                 Clitoral/Preputial Gland                                                           
                                                 Heart                                                                              
                                                 Islets, Pancreatic                                                                 
                                                 Liver                                                                              
                                                 Lung                                                                               
                                                 Nose                                                                               
                                                 Pancreas                                                                           
                                                 Pituitary Gland                                                                    
                                                 Spleen                                                                             
                                                 Testes                                                                             
                                                 Thymus                                                                             
                                                 Thyroid Gland                                                                      
                                                 Urinary Bladder                                                                    
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 1       
Statistical Analysis of Primary Tumors in Rats(FISCHER 344)        -   WATER DISINFECTION BYPRODUCTS (BROMODICHL                    
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Adrenal Medulla                                                                                                                  | 
|     Pheochromocytoma Benign                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  8/50 (16%)               9/50 (18%)               12/50 (24%)              8/49 (16%)      | 
|POLY-3 RATE (b)    |                  8/42.82                  9/43.30                  12/45.17                 8/42.20         | 
|POLY-3 PERCENT (g) |                  18.7%                    20.8%                    26.6%                    19.0%           | 
|TERMINAL (d)       |                  7/29 (24%)               6/28 (21%)               5/29 (17%)               5/26 (19%)      | 
|FIRST INCIDENCE    |                  722                      683                      649                      693             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.439                  P=0.456                  P=0.240                  P=0.511         | 
|POLY 3             |                  P=0.524                  P=0.510                  P=0.265                  P=0.597         | 
|POLY 1.5           |                  P=0.526                  P=0.510                  P=0.251                  P=0.598         | 
|POLY 6             |                  P=0.511                  P=0.504                  P=0.278                  P=0.585         | 
|LOGISTIC REGRESSION|                  P=0.485                  P=0.454                  P=0.245                  P=0.525         | 
|COCH-ARM / FISHERS |                  P=0.516                  P=0.500                  P=0.227                  P=0.590         | 
|ORDER RESTRICTED   |                  P=0.502                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Adrenal Medulla                                                                                                                  | 
|     Pheochromocytoma Complex                                                                                                    | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  2/50 (4%)                1/50 (2%)                0/50 (0%)                0/49 (0%)       | 
|POLY-3 RATE (b)    |                  2/43.15                  1/43.15                  0/44.15                  0/41.84         | 
|POLY-3 PERCENT (g) |                  4.6%                     2.3%                     0.0%                     0.0%            | 
|TERMINAL (d)       |                  0/29 (0%)                0/28 (0%)                0/29 (0%)                0/26 (0%)       | 
|FIRST INCIDENCE    |                  655                      681                      ---                      ---             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.111N                 P=0.511N                 P=0.241N                 P=0.269N        | 
|POLY 3             |                  P=0.101N                 P=0.500N                 P=0.232N                 P=0.244N        | 
|POLY 1.5           |                  P=0.102N                 P=0.498N                 P=0.233N                 P=0.241N        | 
|POLY 6             |                  P=0.101N                 P=0.506N                 P=0.234N                 P=0.250N        | 
|LOGISTIC REGRESSION|                  P=0.103N                 P=0.501N                 P=0.239N                 P=0.242N        | 
|COCH-ARM / FISHERS |                  P=0.102N                 P=0.500N                 P=0.247N                 P=0.253N        | 
|ORDER RESTRICTED   |                  P=0.078N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 2       
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Adrenal Medulla                                                                                                                  | 
|     Pheochromocytoma Malignant                                                                                                  | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  1/50 (2%)                0/50 (0%)                1/50 (2%)                2/49 (4%)       | 
|POLY-3 RATE (b)    |                  1/42.84                  0/42.97                  1/44.15                  2/41.87         | 
|POLY-3 PERCENT (g) |                  2.3%                     0.0%                     2.3%                     4.8%            | 
|TERMINAL (d)       |                  0/29 (0%)                0/28 (0%)                1/29 (3%)                1/26 (4%)       | 
|FIRST INCIDENCE    |                  718                      ---                      729 (T)                  722             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.221                  P=0.527N                 P=0.760                  P=0.452         | 
|POLY 3             |                  P=0.242                  P=0.499N                 P=0.754N                 P=0.492         | 
|POLY 1.5           |                  P=0.243                  P=0.499N                 P=0.755N                 P=0.495         | 
|POLY 6             |                  P=0.238                  P=0.502N                 P=0.755N                 P=0.484         | 
|LOGISTIC REGRESSION|                  P=0.222                  P=0.505N                 P=0.760N                 P=0.465         | 
|COCH-ARM / FISHERS |                  P=0.242                  P=0.500N                 P=0.753N                 P=0.492         | 
|ORDER RESTRICTED   |                  P=0.216                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Adrenal Medulla                                                                                                                  | 
|     Pheochromocytoma: Benign, Complex, Malignant, NOS                                                                           | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  11/50 (22%)              10/50 (20%)              13/50 (26%)              9/49 (18%)      | 
|POLY-3 RATE (b)    |                  11/43.22                 10/43.49                 13/45.17                 9/42.22         | 
|POLY-3 PERCENT (g) |                  25.5%                    23.0%                    28.8%                    21.3%           | 
|TERMINAL (d)       |                  7/29 (24%)               6/28 (21%)               6/29 (21%)               5/26 (19%)      | 
|FIRST INCIDENCE    |                  655                      681                      649                      693             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.505N                 P=0.549N                 P=0.417                  P=0.518N        | 
|POLY 3             |                  P=0.417N                 P=0.494N                 P=0.455                  P=0.422N        | 
|POLY 1.5           |                  P=0.412N                 P=0.492N                 P=0.440                  P=0.416N        | 
|POLY 6             |                  P=0.436N                 P=0.505N                 P=0.466                  P=0.444N        | 
|LOGISTIC REGRESSION|                  P=0.442N                 P=0.520N                 P=0.440                  P=0.469N        | 
|COCH-ARM / FISHERS |                  P=0.418N                 P=0.500N                 P=0.408                  P=0.421N        | 
|ORDER RESTRICTED   |                  P=0.499N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 3       
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Brain                                                                                                                            | 
|     Oligodendroglioma, Glioma, or Astrocytoma                                                                                   | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  2/50 (4%)                1/50 (2%)                0/50 (0%)                0/50 (0%)       | 
|POLY-3 RATE (b)    |                  2/42.79                  1/43.34                  0/44.15                  0/42.45         | 
|POLY-3 PERCENT (g) |                  4.7%                     2.3%                     0.0%                     0.0%            | 
|TERMINAL (d)       |                  2/29 (7%)                0/28 (0%)                0/29 (0%)                0/26 (0%)       | 
|FIRST INCIDENCE    |                  729 (T)                  624                      ---                      ---             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.105N                 P=0.503N                 P=0.238N                 P=0.262N        | 
|POLY 3             |                  P=0.100N                 P=0.496N                 P=0.230N                 P=0.239N        | 
|POLY 1.5           |                  P=0.100N                 P=0.496N                 P=0.232N                 P=0.237N        | 
|POLY 6             |                  P=0.100N                 P=0.498N                 P=0.230N                 P=0.245N        | 
|LOGISTIC REGRESSION|                  P=0.100N                 P=0.499N                 (e)                      (e)             | 
|COCH-ARM / FISHERS |                  P=0.101N                 P=0.500N                 P=0.247N                 P=0.247N        | 
|ORDER RESTRICTED   |                  P=0.075N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Clitoral/Preputial Gland                                                                                                         | 
|     Adenoma                                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  2/50 (4%)                2/50 (4%)                3/50 (6%)                0/49 (0%)       | 
|POLY-3 RATE (b)    |                  2/43.54                  2/42.97                  3/44.15                  0/41.45         | 
|POLY-3 PERCENT (g) |                  4.6%                     4.7%                     6.8%                     0.0%            | 
|TERMINAL (d)       |                  1/29 (3%)                2/28 (7%)                3/29 (10%)               0/25 (0%)       | 
|FIRST INCIDENCE    |                  459                      729 (T)                  729 (T)                  ---             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.227N                 P=0.686                  P=0.502                  P=0.254N        | 
|POLY 3             |                  P=0.213N                 P=0.689                  P=0.506                  P=0.248N        | 
|POLY 1.5           |                  P=0.207N                 P=0.692                  P=0.506                  P=0.244N        | 
|POLY 6             |                  P=0.224N                 P=0.683                  P=0.503                  P=0.256N        | 
|LOGISTIC REGRESSION|                  P=0.204N                 P=0.688                  P=0.486                  P=0.275N        | 
|COCH-ARM / FISHERS |                  P=0.204N                 P=0.691N                 P=0.500                  P=0.253N        | 
|ORDER RESTRICTED   |                  P=0.166N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 4       
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Clitoral/Preputial Gland                                                                                                         | 
|     Carcinoma                                                                                                                   | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  1/50 (2%)                3/50 (6%)                0/50 (0%)                1/49 (2%)       | 
|POLY-3 RATE (b)    |                  1/42.82                  3/43.65                  0/44.15                  1/41.45         | 
|POLY-3 PERCENT (g) |                  2.3%                     6.9%                     0.0%                     2.4%            | 
|TERMINAL (d)       |                  0/29 (0%)                1/28 (4%)                0/29 (0%)                1/25 (4%)       | 
|FIRST INCIDENCE    |                  722                      556                      ---                      729 (T)         | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.440N                 P=0.295                  P=0.500N                 P=0.728         | 
|POLY 3             |                  P=0.414N                 P=0.312                  P=0.494N                 P=0.754         | 
|POLY 1.5           |                  P=0.413N                 P=0.311                  P=0.495N                 P=0.756         | 
|POLY 6             |                  P=0.420N                 P=0.310                  P=0.494N                 P=0.747         | 
|LOGISTIC REGRESSION|                  P=0.416N                 P=0.303                  P=0.497N                 P=0.730         | 
|COCH-ARM / FISHERS |                  P=0.416N                 P=0.309                  P=0.500N                 P=0.747         | 
|ORDER RESTRICTED   |                  P=0.277N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Clitoral/Preputial Gland                                                                                                         | 
|     Carcinoma or Adenoma                                                                                                        | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  3/50 (6%)                5/50 (10%)               3/50 (6%)                1/49 (2%)       | 
|POLY-3 RATE (b)    |                  3/43.57                  5/43.65                  3/44.15                  1/41.45         | 
|POLY-3 PERCENT (g) |                  6.9%                     11.5%                    6.8%                     2.4%            | 
|TERMINAL (d)       |                  1/29 (3%)                3/28 (11%)               3/29 (10%)               1/25 (4%)       | 
|FIRST INCIDENCE    |                  459                      556                      729 (T)                  729 (T)         | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.191N                 P=0.344                  P=0.660N                 P=0.345N        | 
|POLY 3             |                  P=0.172N                 P=0.357                  P=0.657N                 P=0.323N        | 
|POLY 1.5           |                  P=0.166N                 P=0.359                  P=0.657N                 P=0.317N        | 
|POLY 6             |                  P=0.184N                 P=0.350                  P=0.661N                 P=0.336N        | 
|LOGISTIC REGRESSION|                  P=0.163N                 P=0.348                  P=0.659                  P=0.318N        | 
|COCH-ARM / FISHERS |                  P=0.163N                 P=0.357                  P=0.661N                 P=0.316N        | 
|ORDER RESTRICTED   |                  P=0.173N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 5       
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Islets, Pancreatic                                                                                                               | 
|     Adenoma                                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  3/49 (6%)                1/50 (2%)                5/50 (10%)               3/49 (6%)       | 
|POLY-3 RATE (b)    |                  3/42.65                  1/42.97                  5/44.39                  3/42.01         | 
|POLY-3 PERCENT (g) |                  7.0%                     2.3%                     11.3%                    7.1%            | 
|TERMINAL (d)       |                  2/29 (7%)                1/28 (4%)                2/29 (7%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  722                      729 (T)                  697                      686             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.372                  P=0.325N                 P=0.360                  P=0.612         | 
|POLY 3             |                  P=0.411                  P=0.302N                 P=0.378                  P=0.656         | 
|POLY 1.5           |                  P=0.416                  P=0.299N                 P=0.376                  P=0.660         | 
|POLY 6             |                  P=0.401                  P=0.308N                 P=0.378                  P=0.646         | 
|LOGISTIC REGRESSION|                  P=0.384                  P=0.331N                 P=0.366                  P=0.626         | 
|COCH-ARM / FISHERS |                  P=0.417                  P=0.301N                 P=0.369                  P=0.661N        | 
|ORDER RESTRICTED   |                  P=0.326                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Islets, Pancreatic                                                                                                               | 
|     Carcinoma or Adenoma                                                                                                        | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  3/49 (6%)                2/50 (4%)                6/50 (12%)               4/49 (8%)       | 
|POLY-3 RATE (b)    |                  3/42.65                  2/43.20                  6/44.62                  4/42.23         | 
|POLY-3 PERCENT (g) |                  7.0%                     4.6%                     13.5%                    9.5%            | 
|TERMINAL (d)       |                  2/29 (7%)                1/28 (4%)                2/29 (7%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  722                      667                      667                      672             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.264                  P=0.516N                 P=0.253                  P=0.445         | 
|POLY 3             |                  P=0.300                  P=0.494N                 P=0.264                  P=0.495         | 
|POLY 1.5           |                  P=0.305                  P=0.492N                 P=0.261                  P=0.499         | 
|POLY 6             |                  P=0.291                  P=0.500N                 P=0.266                  P=0.485         | 
|LOGISTIC REGRESSION|                  P=0.291                  P=0.506N                 P=0.256                  P=0.474         | 
|COCH-ARM / FISHERS |                  P=0.306                  P=0.490N                 P=0.254                  P=0.500         | 
|ORDER RESTRICTED   |                  P=0.282                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 6       
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver                                                                                                                            | 
|     Hepatocellular Adenoma                                                                                                      | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  1/49 (2%)                2/50 (4%)                3/50 (6%)                0/50 (0%)       | 
|POLY-3 RATE (b)    |                  1/42.62                  2/43.14                  3/44.15                  0/42.45         | 
|POLY-3 PERCENT (g) |                  2.4%                     4.6%                     6.8%                     0.0%            | 
|TERMINAL (d)       |                  1/29 (3%)                1/28 (4%)                3/29 (10%)               0/26 (0%)       | 
|FIRST INCIDENCE    |                  729 (T)                  683                      729 (T)                  ---             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.367N                 P=0.489                  P=0.304                  P=0.522N        | 
|POLY 3             |                  P=0.342N                 P=0.504                  P=0.318                  P=0.501N        | 
|POLY 1.5           |                  P=0.336N                 P=0.506                  P=0.317                  P=0.498N        | 
|POLY 6             |                  P=0.356N                 P=0.500                  P=0.316                  P=0.507N        | 
|LOGISTIC REGRESSION|                  P=0.359N                 P=0.497                  P=0.304                  (e)             | 
|COCH-ARM / FISHERS |                  P=0.332N                 P=0.508                  P=0.316                  P=0.495N        | 
|ORDER RESTRICTED   |                  P=0.193N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Lung                                                                                                                             | 
|     Alveolar/Bronchiolar Carcinoma                                                                                              | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  1/50 (2%)                0/50 (0%)                2/50 (4%)                0/50 (0%)       | 
|POLY-3 RATE (b)    |                  1/42.98                  0/42.97                  2/44.73                  0/42.45         | 
|POLY-3 PERCENT (g) |                  2.3%                     0.0%                     4.5%                     0.0%            | 
|TERMINAL (d)       |                  0/29 (0%)                0/28 (0%)                1/29 (3%)                0/26 (0%)       | 
|FIRST INCIDENCE    |                  680                      ---                      548                      ---             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.474N                 P=0.505N                 P=0.504                  P=0.522N        | 
|POLY 3             |                  P=0.465N                 P=0.500N                 P=0.514                  P=0.503N        | 
|POLY 1.5           |                  P=0.462N                 P=0.499N                 P=0.510                  P=0.500N        | 
|POLY 6             |                  P=0.472N                 P=0.504N                 P=0.514                  P=0.509N        | 
|LOGISTIC REGRESSION|                  P=0.473N                 P=0.501N                 P=0.466                  P=0.500N        | 
|COCH-ARM / FISHERS |                  P=0.461N                 P=0.500N                 P=0.500                  P=0.500N        | 
|ORDER RESTRICTED   |                  P=0.328N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 7       
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Lung                                                                                                                             | 
|     Alveolar/Bronchiolar Carcinoma or Alveolar/Bronchiolar                                                                      | 
|     Adenoma                                                                                                                     | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  1/50 (2%)                1/50 (2%)                2/50 (4%)                0/50 (0%)       | 
|POLY-3 RATE (b)    |                  1/42.98                  1/42.97                  2/44.73                  0/42.45         | 
|POLY-3 PERCENT (g) |                  2.3%                     2.3%                     4.5%                     0.0%            | 
|TERMINAL (d)       |                  0/29 (0%)                1/28 (4%)                1/29 (3%)                0/26 (0%)       | 
|FIRST INCIDENCE    |                  680                      729 (T)                  548                      ---             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.384N                 P=0.753                  P=0.504                  P=0.522N        | 
|POLY 3             |                  P=0.370N                 P=0.761                  P=0.514                  P=0.503N        | 
|POLY 1.5           |                  P=0.367N                 P=0.760N                 P=0.510                  P=0.500N        | 
|POLY 6             |                  P=0.380N                 P=0.757                  P=0.514                  P=0.509N        | 
|LOGISTIC REGRESSION|                  P=0.370N                 P=0.762N                 P=0.466                  P=0.500N        | 
|COCH-ARM / FISHERS |                  P=0.366N                 P=0.753N                 P=0.500                  P=0.500N        | 
|ORDER RESTRICTED   |                  P=0.279N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Mammary Gland                                                                                                                    | 
|     Fibroadenoma                                                                                                                | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  1/50 (2%)                4/50 (8%)                2/50 (4%)                2/50 (4%)       | 
|POLY-3 RATE (b)    |                  1/42.79                  4/42.97                  2/44.38                  2/42.45         | 
|POLY-3 PERCENT (g) |                  2.3%                     9.3%                     4.5%                     4.7%            | 
|TERMINAL (d)       |                  1/29 (3%)                4/28 (14%)               1/29 (3%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  729 (T)                  729 (T)                  669                      729 (T)         | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.527                  P=0.166                  P=0.503                  P=0.462         | 
|POLY 3             |                  P=0.566                  P=0.179                  P=0.513                  P=0.497         | 
|POLY 1.5           |                  P=0.571                  P=0.181                  P=0.509                  P=0.501         | 
|POLY 6             |                  P=0.551                  P=0.174                  P=0.514                  P=0.488         | 
|LOGISTIC REGRESSION|                  P=0.535                  P=0.166                  P=0.510                  P=0.462         | 
|COCH-ARM / FISHERS |                  P=0.569                  P=0.181                  P=0.500                  P=0.500         | 
|ORDER RESTRICTED   |                  P=0.342                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 8       
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Mammary Gland                                                                                                                    | 
|     Fibroma, Fibroadenoma or Adenoma                                                                                            | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  2/50 (4%)                4/50 (8%)                2/50 (4%)                3/50 (6%)       | 
|POLY-3 RATE (b)    |                  2/42.79                  4/42.97                  2/44.38                  3/42.58         | 
|POLY-3 PERCENT (g) |                  4.7%                     9.3%                     4.5%                     7.1%            | 
|TERMINAL (d)       |                  2/29 (7%)                4/28 (14%)               1/29 (3%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  729 (T)                  729 (T)                  669                      695             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.472                  P=0.318                  P=0.692N                 P=0.450         | 
|POLY 3             |                  P=0.520                  P=0.338                  P=0.681N                 P=0.498         | 
|POLY 1.5           |                  P=0.524                  P=0.340                  P=0.684N                 P=0.502         | 
|POLY 6             |                  P=0.509                  P=0.331                  P=0.680N                 P=0.487         | 
|LOGISTIC REGRESSION|                  P=0.488                  P=0.318                  P=0.685N                 P=0.458         | 
|COCH-ARM / FISHERS |                  P=0.521                  P=0.339                  P=0.691N                 P=0.500         | 
|ORDER RESTRICTED   |                  P=0.517                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Mammary Gland                                                                                                                    | 
|     Fibroma, Fibroadenoma, Carcinoma, or Adenoma                                                                                | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  2/50 (4%)                4/50 (8%)                2/50 (4%)                3/50 (6%)       | 
|POLY-3 RATE (b)    |                  2/42.79                  4/42.97                  2/44.38                  3/42.58         | 
|POLY-3 PERCENT (g) |                  4.7%                     9.3%                     4.5%                     7.1%            | 
|TERMINAL (d)       |                  2/29 (7%)                4/28 (14%)               1/29 (3%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  729 (T)                  729 (T)                  669                      695             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.472                  P=0.318                  P=0.692N                 P=0.450         | 
|POLY 3             |                  P=0.520                  P=0.338                  P=0.681N                 P=0.498         | 
|POLY 1.5           |                  P=0.524                  P=0.340                  P=0.684N                 P=0.502         | 
|POLY 6             |                  P=0.509                  P=0.331                  P=0.680N                 P=0.487         | 
|LOGISTIC REGRESSION|                  P=0.488                  P=0.318                  P=0.685N                 P=0.458         | 
|COCH-ARM / FISHERS |                  P=0.521                  P=0.339                  P=0.691N                 P=0.500         | 
|ORDER RESTRICTED   |                  P=0.517                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 9       
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Pancreas                                                                                                                         | 
|     Adenoma                                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  3/49 (6%)                1/50 (2%)                4/50 (8%)                4/49 (8%)       | 
|POLY-3 RATE (b)    |                  3/42.67                  1/42.97                  4/44.16                  4/42.02         | 
|POLY-3 PERCENT (g) |                  7.0%                     2.3%                     9.1%                     9.5%            | 
|TERMINAL (d)       |                  2/29 (7%)                1/28 (4%)                3/29 (10%)               2/26 (8%)       | 
|FIRST INCIDENCE    |                  718                      729 (T)                  727                      705             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.229                  P=0.328N                 P=0.503                  P=0.433         | 
|POLY 3             |                  P=0.266                  P=0.302N                 P=0.519                  P=0.492         | 
|POLY 1.5           |                  P=0.269                  P=0.300N                 P=0.518                  P=0.497         | 
|POLY 6             |                  P=0.258                  P=0.308N                 P=0.516                  P=0.479         | 
|LOGISTIC REGRESSION|                  P=0.229                  P=0.329N                 P=0.502                  P=0.452         | 
|COCH-ARM / FISHERS |                  P=0.270                  P=0.301N                 P=0.511                  P=0.500         | 
|ORDER RESTRICTED   |                  P=0.305                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Pituitary Gland: Pars Distalis or Unspecified Site                                                                               | 
|     Adenoma                                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  22/49 (45%)              29/50 (58%)              28/50 (56%)              26/48 (54%)     | 
|POLY-3 RATE (b)    |                  22/44.57                 29/46.34                 28/47.16                 26/44.23        | 
|POLY-3 PERCENT (g) |                  49.4%                    62.6%                    59.4%                    58.8%           | 
|TERMINAL (d)       |                  13/29 (45%)              17/28 (61%)              17/29 (59%)              12/25 (48%)     | 
|FIRST INCIDENCE    |                  459                      526                      430                      486             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.210                  P=0.128                  P=0.207                  P=0.175         | 
|POLY 3             |                  P=0.300                  P=0.140                  P=0.222                  P=0.245         | 
|POLY 1.5           |                  P=0.303                  P=0.139                  P=0.212                  P=0.248         | 
|POLY 6             |                  P=0.288                  P=0.139                  P=0.221                  P=0.235         | 
|LOGISTIC REGRESSION|                  P=0.293                  P=0.139                  P=0.199                  P=0.240         | 
|COCH-ARM / FISHERS |                  P=0.289                  P=0.135                  P=0.183                  P=0.239         | 
|ORDER RESTRICTED   |                  P=0.234                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 10      
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Skin                                                                                                                             | 
|     Basal Cell Carcinoma, Basal Cell Adenoma, Basosquamous                                                                      | 
|     Tumor (benign, malignant or NOS), or Trichoepithelioma                                                                      | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  2/50 (4%)                0/50 (0%)                1/50 (2%)                1/50 (2%)       | 
|POLY-3 RATE (b)    |                  2/42.82                  0/42.97                  1/44.15                  1/42.45         | 
|POLY-3 PERCENT (g) |                  4.7%                     0.0%                     2.3%                     2.4%            | 
|TERMINAL (d)       |                  1/29 (3%)                0/28 (0%)                1/29 (3%)                1/26 (4%)       | 
|FIRST INCIDENCE    |                  722                      ---                      729 (T)                  729 (T)         | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.530N                 P=0.255N                 P=0.500N                 P=0.541N        | 
|POLY 3             |                  P=0.500N                 P=0.236N                 P=0.489N                 P=0.503N        | 
|POLY 1.5           |                  P=0.500N                 P=0.236N                 P=0.492N                 P=0.499N        | 
|POLY 6             |                  P=0.501N                 P=0.239N                 P=0.490N                 P=0.513N        | 
|LOGISTIC REGRESSION|                  P=0.531N                 P=0.251N                 P=0.498N                 P=0.544N        | 
|COCH-ARM / FISHERS |                  P=0.500N                 P=0.247N                 P=0.500N                 P=0.500N        | 
|ORDER RESTRICTED   |                  P=0.272N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Skin                                                                                                                             | 
|     Basal or Sq. Cell Carcinoma, Carcinoma, Basosq. Tumor                                                                       | 
|     (M or B), Basal Cell Adenoma, Adenoma, Papilloma, Sq Papilloma, Keratoacanthoma, Trichoepitheliom                           | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  4/50 (8%)                1/50 (2%)                2/50 (4%)                5/50 (10%)      | 
|POLY-3 RATE (b)    |                  4/42.82                  1/42.97                  2/44.15                  5/42.98         | 
|POLY-3 PERCENT (g) |                  9.3%                     2.3%                     4.5%                     11.6%           | 
|TERMINAL (d)       |                  3/29 (10%)               1/28 (4%)                2/29 (7%)                3/26 (12%)      | 
|FIRST INCIDENCE    |                  722                      729 (T)                  729 (T)                  642             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.231                  P=0.195N                 P=0.337N                 P=0.437         | 
|POLY 3             |                  P=0.274                  P=0.177N                 P=0.323N                 P=0.502         | 
|POLY 1.5           |                  P=0.275                  P=0.176N                 P=0.326N                 P=0.505         | 
|POLY 6             |                  P=0.271                  P=0.181N                 P=0.323N                 P=0.492         | 
|LOGISTIC REGRESSION|                  P=0.250                  P=0.201N                 P=0.332N                 P=0.477         | 
|COCH-ARM / FISHERS |                  P=0.273                  P=0.181N                 P=0.339N                 P=0.500         | 
|ORDER RESTRICTED   |                  P=0.200                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 11      
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Skin                                                                                                                             | 
|     Fibroma                                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  6/50 (12%)               8/50 (16%)               10/50 (20%)              6/50 (12%)      | 
|POLY-3 RATE (b)    |                  6/42.87                  8/44.42                  10/45.20                 6/42.84         | 
|POLY-3 PERCENT (g) |                  14.0%                    18.0%                    22.1%                    14.0%           | 
|TERMINAL (d)       |                  5/29 (17%)               5/28 (18%)               5/29 (17%)               3/26 (12%)      | 
|FIRST INCIDENCE    |                  709                      526                      642                      686             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.501                  P=0.366                  P=0.214                  P=0.541         | 
|POLY 3             |                  P=0.534N                 P=0.413                  P=0.238                  P=0.621         | 
|POLY 1.5           |                  P=0.526N                 P=0.406                  P=0.227                  P=0.617N        | 
|POLY 6             |                  P=0.553                  P=0.416                  P=0.248                  P=0.608         | 
|LOGISTIC REGRESSION|                  P=0.530N                 P=0.390                  P=0.224                  P=0.573         | 
|COCH-ARM / FISHERS |                  P=0.527N                 P=0.387                  P=0.207                  P=0.620N        | 
|ORDER RESTRICTED   |                  P=0.482                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Skin                                                                                                                             | 
|     Fibroma, Fibrosarcoma, Sarcoma, Myxoma, Myxosarcoma,                                                                        | 
|     or Fibrous Histiocytoma                                                                                                     | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  7/50 (14%)               9/50 (18%)               10/50 (20%)              7/50 (14%)      | 
|POLY-3 RATE (b)    |                  7/42.87                  9/44.42                  10/45.20                 7/43.19         | 
|POLY-3 PERCENT (g) |                  16.3%                    20.3%                    22.1%                    16.2%           | 
|TERMINAL (d)       |                  6/29 (21%)               6/28 (21%)               5/29 (17%)               3/26 (12%)      | 
|FIRST INCIDENCE    |                  709                      526                      642                      633             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.509                  P=0.369                  P=0.302                  P=0.535         | 
|POLY 3             |                  P=0.511N                 P=0.422                  P=0.338                  P=0.609N        | 
|POLY 1.5           |                  P=0.507N                 P=0.413                  P=0.324                  P=0.606N        | 
|POLY 6             |                  P=0.524N                 P=0.424                  P=0.351                  P=0.611         | 
|LOGISTIC REGRESSION|                  P=0.516N                 P=0.396                  P=0.320                  P=0.583         | 
|COCH-ARM / FISHERS |                  P=0.513N                 P=0.393                  P=0.298                  P=0.613N        | 
|ORDER RESTRICTED   |                  P=0.539N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 12      
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Skin                                                                                                                             | 
|     Keratoacanthoma                                                                                                             | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  3/50 (6%)                1/50 (2%)                2/50 (4%)                3/50 (6%)       | 
|POLY-3 RATE (b)    |                  3/42.82                  1/42.97                  2/44.15                  3/42.76         | 
|POLY-3 PERCENT (g) |                  7.0%                     2.3%                     4.5%                     7.0%            | 
|TERMINAL (d)       |                  2/29 (7%)                1/28 (4%)                2/29 (7%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  722                      729 (T)                  729 (T)                  642             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.434                  P=0.325N                 P=0.500N                 P=0.613         | 
|POLY 3             |                  P=0.477                  P=0.304N                 P=0.486N                 P=0.662         | 
|POLY 1.5           |                  P=0.479                  P=0.303N                 P=0.489N                 P=0.660N        | 
|POLY 6             |                  P=0.471                  P=0.308N                 P=0.487N                 P=0.653         | 
|LOGISTIC REGRESSION|                  P=0.451                  P=0.331N                 P=0.498N                 P=0.645         | 
|COCH-ARM / FISHERS |                  P=0.477                  P=0.309N                 P=0.500N                 P=0.661N        | 
|ORDER RESTRICTED   |                  P=0.489                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Skin                                                                                                                             | 
|     Squamous Cell Papilloma, Papilloma, Squamous Cell                                                                           | 
|     Carcinoma or Keratoacanthoma                                                                                                | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  3/50 (6%)                1/50 (2%)                2/50 (4%)                4/50 (8%)       | 
|POLY-3 RATE (b)    |                  3/42.82                  1/42.97                  2/44.15                  4/42.98         | 
|POLY-3 PERCENT (g) |                  7.0%                     2.3%                     4.5%                     9.3%            | 
|TERMINAL (d)       |                  2/29 (7%)                1/28 (4%)                2/29 (7%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  722                      729 (T)                  729 (T)                  642             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.253                  P=0.325N                 P=0.500N                 P=0.446         | 
|POLY 3             |                  P=0.293                  P=0.304N                 P=0.486N                 P=0.502         | 
|POLY 1.5           |                  P=0.294                  P=0.303N                 P=0.489N                 P=0.504         | 
|POLY 6             |                  P=0.290                  P=0.308N                 P=0.487N                 P=0.493         | 
|LOGISTIC REGRESSION|                  P=0.275                  P=0.331N                 P=0.498N                 P=0.488         | 
|COCH-ARM / FISHERS |                  P=0.292                  P=0.309N                 P=0.500N                 P=0.500         | 
|ORDER RESTRICTED   |                  P=0.281                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 13      
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Skin                                                                                                                             | 
|     Squamous Cell Papilloma, Papilloma, or Keratoacanthoma                                                                      | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  3/50 (6%)                1/50 (2%)                2/50 (4%)                4/50 (8%)       | 
|POLY-3 RATE (b)    |                  3/42.82                  1/42.97                  2/44.15                  4/42.98         | 
|POLY-3 PERCENT (g) |                  7.0%                     2.3%                     4.5%                     9.3%            | 
|TERMINAL (d)       |                  2/29 (7%)                1/28 (4%)                2/29 (7%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  722                      729 (T)                  729 (T)                  642             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.253                  P=0.325N                 P=0.500N                 P=0.446         | 
|POLY 3             |                  P=0.293                  P=0.304N                 P=0.486N                 P=0.502         | 
|POLY 1.5           |                  P=0.294                  P=0.303N                 P=0.489N                 P=0.504         | 
|POLY 6             |                  P=0.290                  P=0.308N                 P=0.487N                 P=0.493         | 
|LOGISTIC REGRESSION|                  P=0.275                  P=0.331N                 P=0.498N                 P=0.488         | 
|COCH-ARM / FISHERS |                  P=0.292                  P=0.309N                 P=0.500N                 P=0.500         | 
|ORDER RESTRICTED   |                  P=0.281                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Testes                                                                                                                           | 
|     Adenoma                                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  45/50 (90%)              47/50 (94%)              41/50 (82%)              47/50 (94%)     | 
|POLY-3 RATE (b)    |                  45/47.36                 47/48.65                 41/47.64                 47/49.02        | 
|POLY-3 PERCENT (g) |                  95.0%                    96.6%                    86.1%                    95.9%           | 
|TERMINAL (d)       |                  28/29 (97%)              28/28 (100%)             26/29 (90%)              25/26 (96%)     | 
|FIRST INCIDENCE    |                  405                      498                      526                      448             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.240                  P=0.343                  P=0.294N                 P=0.212         | 
|POLY 3             |                  P=0.538N                 P=0.559                  P=0.102N                 P=0.629         | 
|POLY 1.5           |                  P=0.565                  P=0.469                  P=0.124N                 P=0.518         | 
|POLY 6             |                  P=0.494N                 P=0.647                  P=0.100N                 P=0.728         | 
|LOGISTIC REGRESSION|                  P=0.528                  P=0.473                  P=0.077N                 P=0.467         | 
|COCH-ARM / FISHERS |                  P=0.437                  P=0.357                  P=0.194N                 P=0.357         | 
|ORDER RESTRICTED   |                  P=0.224N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 14      
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Thyroid Gland: C-Cell                                                                                                            | 
|     Adenoma                                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  8/46 (17%)               6/48 (13%)               10/44 (23%)              7/42 (17%)      | 
|POLY-3 RATE (b)    |                  8/41.34                  6/41.66                  10/39.78                 7/37.14         | 
|POLY-3 PERCENT (g) |                  19.4%                    14.4%                    25.1%                    18.9%           | 
|TERMINAL (d)       |                  5/29 (17%)               5/28 (18%)               8/29 (28%)               7/26 (27%)      | 
|FIRST INCIDENCE    |                  526                      624                      709                      729 (T)         | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.487                  P=0.401N                 P=0.400                  P=0.579N        | 
|POLY 3             |                  P=0.462                  P=0.379N                 P=0.360                  P=0.591N        | 
|POLY 1.5           |                  P=0.467                  P=0.366N                 P=0.362                  P=0.581N        | 
|POLY 6             |                  P=0.447                  P=0.403N                 P=0.350                  P=0.612N        | 
|LOGISTIC REGRESSION|                  P=0.488                  P=0.355N                 P=0.379                  P=0.567N        | 
|COCH-ARM / FISHERS |                  P=0.465                  P=0.354N                 P=0.356                  P=0.577N        | 
|ORDER RESTRICTED   |                  P=0.445                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Thyroid Gland: C-Cell                                                                                                            | 
|     Carcinoma                                                                                                                   | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  1/46 (2%)                1/48 (2%)                1/44 (2%)                4/42 (10%)      | 
|POLY-3 RATE (b)    |                  1/40.05                  1/41.28                  1/39.67                  4/37.54         | 
|POLY-3 PERCENT (g) |                  2.5%                     2.4%                     2.5%                     10.7%           | 
|TERMINAL (d)       |                  1/29 (3%)                1/28 (4%)                1/29 (3%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  729 (T)                  729 (T)                  729 (T)                  642             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.055                  P=0.754                  P=0.762                  P=0.154         | 
|POLY 3             |                  P=0.054                  P=0.754N                 P=0.759                  P=0.158         | 
|POLY 1.5           |                  P=0.053                  P=0.752N                 P=0.756                  P=0.156         | 
|POLY 6             |                  P=0.055                  P=0.758N                 P=0.761                  P=0.158         | 
|LOGISTIC REGRESSION|                  P=0.054                  P=0.754                  P=0.762                  P=0.156         | 
|COCH-ARM / FISHERS |                  P=0.051                  P=0.742N                 P=0.742                  P=0.153         | 
|ORDER RESTRICTED   |                  P=0.059                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 15      
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Thyroid Gland: C-Cell                                                                                                            | 
|     Carcinoma or Adenoma                                                                                                        | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  9/46 (20%)               7/48 (15%)               11/44 (25%)              11/42 (26%)     | 
|POLY-3 RATE (b)    |                  9/41.34                  7/41.66                  11/39.78                 11/37.54        | 
|POLY-3 PERCENT (g) |                  21.8%                    16.8%                    27.7%                    29.3%           | 
|TERMINAL (d)       |                  6/29 (21%)               6/28 (21%)               9/29 (31%)               9/26 (35%)      | 
|FIRST INCIDENCE    |                  526                      624                      709                      642             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.179                  P=0.409N                 P=0.404                  P=0.312         | 
|POLY 3             |                  P=0.164                  P=0.384N                 P=0.360                  P=0.305         | 
|POLY 1.5           |                  P=0.166                  P=0.370N                 P=0.363                  P=0.312         | 
|POLY 6             |                  P=0.159                  P=0.410N                 P=0.350                  P=0.290         | 
|LOGISTIC REGRESSION|                  P=0.178                  P=0.360N                 P=0.385                  P=0.324         | 
|COCH-ARM / FISHERS |                  P=0.164                  P=0.357N                 P=0.357                  P=0.313         | 
|ORDER RESTRICTED   |                  P=0.237                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Thyroid Gland: Follicular Cell                                                                                                   | 
|     Carcinoma                                                                                                                   | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  0/46 (0%)                2/48 (4%)                0/44 (0%)                0/42 (0%)       | 
|POLY-3 RATE (b)    |                  0/40.05                  2/41.36                  0/39.67                  0/37.14         | 
|POLY-3 PERCENT (g) |                  0.0%                     4.8%                     0.0%                     0.0%            | 
|TERMINAL (d)       |                  0/29 (0%)                1/28 (4%)                0/29 (0%)                0/26 (0%)       | 
|FIRST INCIDENCE    |                  ---                      709                      ---                      ---             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.425N                 P=0.226                  (e)                      (e)             | 
|POLY 3             |                  P=0.423N                 P=0.244                  (e)                      (e)             | 
|POLY 1.5           |                  P=0.423N                 P=0.246                  (e)                      (e)             | 
|POLY 6             |                  P=0.424N                 P=0.240                  (e)                      (e)             | 
|LOGISTIC REGRESSION|                  P=0.422N                 P=0.236                  (e)                      (e)             | 
|COCH-ARM / FISHERS |                  P=0.427N                 P=0.258                  (e)                      (e)             | 
|ORDER RESTRICTED   |                  P=0.269N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 16      
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Thyroid Gland: Follicular Cell                                                                                                   | 
|     Carcinoma or Adenoma                                                                                                        | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  0/46 (0%)                2/48 (4%)                1/44 (2%)                0/42 (0%)       | 
|POLY-3 RATE (b)    |                  0/40.05                  2/41.36                  1/39.67                  0/37.14         | 
|POLY-3 PERCENT (g) |                  0.0%                     4.8%                     2.5%                     0.0%            | 
|TERMINAL (d)       |                  0/29 (0%)                1/28 (4%)                1/29 (3%)                0/26 (0%)       | 
|FIRST INCIDENCE    |                  ---                      709                      729 (T)                  ---             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.486N                 P=0.226                  P=0.500                  (e)             | 
|POLY 3             |                  P=0.483N                 P=0.244                  P=0.498                  (e)             | 
|POLY 1.5           |                  P=0.484N                 P=0.246                  P=0.496                  (e)             | 
|POLY 6             |                  P=0.485N                 P=0.240                  P=0.500                  (e)             | 
|LOGISTIC REGRESSION|                  P=0.483N                 P=0.236                  P=0.500                  (e)             | 
|COCH-ARM / FISHERS |                  P=0.489N                 P=0.258                  P=0.489                  (e)             | 
|ORDER RESTRICTED   |                  P=0.332                  (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|All Organs                                                                                                                       | 
|     Leukemia: Lymphocytic, Monocytic, Mononuclear, or                                                                           | 
|     Undifferentiated                                                                                                            | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  16/50 (32%)              18/50 (36%)              16/50 (32%)              15/50 (30%)     | 
|POLY-3 RATE (b)    |                  16/45.79                 18/45.77                 16/45.70                 15/45.00        | 
|POLY-3 PERCENT (g) |                  34.9%                    39.3%                    35.0%                    33.3%           | 
|TERMINAL (d)       |                  4/29 (14%)               7/28 (25%)               9/29 (31%)               7/26 (27%)      | 
|FIRST INCIDENCE    |                  479                      405                      561                      616             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.501N                 P=0.385                  P=0.568N                 P=0.558         | 
|POLY 3             |                  P=0.413N                 P=0.413                  P=0.584                  P=0.524N        | 
|POLY 1.5           |                  P=0.397N                 P=0.424                  P=0.579N                 P=0.507N        | 
|POLY 6             |                  P=0.446N                 P=0.386                  P=0.556                  P=0.560N        | 
|LOGISTIC REGRESSION|                  P=0.391N                 P=0.410                  P=0.584                  P=0.503N        | 
|COCH-ARM / FISHERS |                  P=0.389N                 P=0.417                  P=0.585N                 P=0.500N        | 
|ORDER RESTRICTED   |                  P=0.553N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 17      
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|All Organs                                                                                                                       | 
|     Mesothelioma: Benign, Malignant, NOS                                                                                        | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  3/50 (6%)                3/50 (6%)                3/50 (6%)                2/50 (4%)       | 
|POLY-3 RATE (b)    |                  3/42.79                  3/43.15                  3/44.78                  2/42.45         | 
|POLY-3 PERCENT (g) |                  7.0%                     7.0%                     6.7%                     4.7%            | 
|TERMINAL (d)       |                  3/29 (10%)               2/28 (7%)                2/29 (7%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  729 (T)                  681                      526                      729 (T)         | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.438N                 P=0.650                  P=0.658N                 P=0.551N        | 
|POLY 3             |                  P=0.399N                 P=0.659N                 P=0.642N                 P=0.504N        | 
|POLY 1.5           |                  P=0.396N                 P=0.658N                 P=0.648N                 P=0.499N        | 
|POLY 6             |                  P=0.410N                 P=0.663                  P=0.639N                 P=0.516N        | 
|LOGISTIC REGRESSION|                  P=0.402N                 P=0.648                  P=0.657N                 P=0.551N        | 
|COCH-ARM / FISHERS |                  P=0.397N                 P=0.661N                 P=0.661N                 P=0.500N        | 
|ORDER RESTRICTED   |                  P=0.525N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|All Organs                                                                                                                       | 
|     Mesothelioma: Malignant                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  3/50 (6%)                3/50 (6%)                3/50 (6%)                2/50 (4%)       | 
|POLY-3 RATE (b)    |                  3/42.79                  3/43.15                  3/44.78                  2/42.45         | 
|POLY-3 PERCENT (g) |                  7.0%                     7.0%                     6.7%                     4.7%            | 
|TERMINAL (d)       |                  3/29 (10%)               2/28 (7%)                2/29 (7%)                2/26 (8%)       | 
|FIRST INCIDENCE    |                  729 (T)                  681                      526                      729 (T)         | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.438N                 P=0.650                  P=0.658N                 P=0.551N        | 
|POLY 3             |                  P=0.399N                 P=0.659N                 P=0.642N                 P=0.504N        | 
|POLY 1.5           |                  P=0.396N                 P=0.658N                 P=0.648N                 P=0.499N        | 
|POLY 6             |                  P=0.410N                 P=0.663                  P=0.639N                 P=0.516N        | 
|LOGISTIC REGRESSION|                  P=0.402N                 P=0.648                  P=0.657N                 P=0.551N        | 
|COCH-ARM / FISHERS |                  P=0.397N                 P=0.661N                 P=0.661N                 P=0.500N        | 
|ORDER RESTRICTED   |                  P=0.525N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 18      
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|All Organs                                                                                                                       | 
|     Benign Tumors                                                                                                               | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  49/50 (98%)              49/50 (98%)              50/50 (100%)             49/50 (98%)     | 
|POLY-3 RATE (b)    |                  49/49.12                 49/49.17                 50/50.00                 49/50.00        | 
|POLY-3 PERCENT (g) |                  99.8%                    99.7%                    100.0%                   98.0%           | 
|TERMINAL (d)       |                  29/29 (100%)             28/28 (100%)             29/29 (100%)             25/26 (96%)     | 
|FIRST INCIDENCE    |                  405                      498                      430                      448             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.287                  P=0.474                  P=0.526                  P=0.318         | 
|POLY 3             |                  P=0.275N                 P=1.000N                 P=1.000                  P=0.549N        | 
|POLY 1.5           |                  P=0.422N                 P=0.956N                 P=0.974                  P=0.629N        | 
|POLY 6             |                  P=0.211N                 P=1.000N                 P=1.000                  P=0.509N        | 
|LOGISTIC REGRESSION|                  P=0.509N                 (e)                      (e)                      P=0.688N        | 
|COCH-ARM / FISHERS |                  P=0.616                  P=0.753N                 P=0.500                  P=0.753N        | 
|ORDER RESTRICTED   |                  P=0.167N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|All Organs                                                                                                                       | 
|     Malignant Tumors                                                                                                            | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  28/50 (56%)              27/50 (54%)              27/50 (54%)              27/50 (54%)     | 
|POLY-3 RATE (b)    |                  28/48.99                 27/47.50                 27/47.83                 27/47.27        | 
|POLY-3 PERCENT (g) |                  57.2%                    56.8%                    56.5%                    57.1%           | 
|TERMINAL (d)       |                  9/29 (31%)               11/28 (39%)              14/29 (48%)              12/26 (46%)     | 
|FIRST INCIDENCE    |                  354                      405                      526                      485             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.458                  P=0.546N                 P=0.484N                 P=0.496         | 
|POLY 3             |                  P=0.538N                 P=0.569N                 P=0.554N                 P=0.581N        | 
|POLY 1.5           |                  P=0.511N                 P=0.541N                 P=0.531N                 P=0.548N        | 
|POLY 6             |                  P=0.502                  P=0.560                  P=0.577                  P=0.542         | 
|LOGISTIC REGRESSION|                  P=0.471N                 P=0.510N                 P=0.559N                 P=0.491N        | 
|COCH-ARM / FISHERS |                  P=0.471N                 P=0.500N                 P=0.500N                 P=0.500N        | 
|ORDER RESTRICTED   |                  P=0.732N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
       Date:  04/15/03                           EXPERIMENT: 96018 TEST: 03                                            Page 19      
                     Statistical Analysis of Primary Tumors in Rats(FISCHER 344)       -   WATER DISINFECTION BYPRODUCTS (BROMODICHL
                                         Terminal Sacrifice at 105 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Males                                                  | 
|Dose               |                  0 MG/L                   175 MG/L                 350 MG/L                 700 MG/L        | 
|                   |                                                                                                             | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|All Organs                                                                                                                       | 
|     Malignant and Benign Tumors                                                                                                 | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|TUMOR RATES        |                  #                        #                        #                        #               | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |                  50/50 (100%)             50/50 (100%)             50/50 (100%)             49/50 (98%)     | 
|POLY-3 RATE (b)    |                  50/50.00                 50/50.00                 50/50.00                 49/50.00        | 
|POLY-3 PERCENT (g) |                  100.0%                   100.0%                   100.0%                   98.0%           | 
|TERMINAL (d)       |                  29/29 (100%)             28/28 (100%)             29/29 (100%)             25/26 (96%)     | 
|FIRST INCIDENCE    |                  354                      405                      430                      448             | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |                  P=0.355                  (e)                      (e)                      P=0.375         | 
|POLY 3             |                  P=0.199N                 (e)                      (e)                      P=0.500N        | 
|POLY 1.5           |                  P=0.199N                 (e)                      (e)                      P=0.500N        | 
|POLY 6             |                  P=0.199N                 (e)                      (e)                      P=0.500N        | 
|LOGISTIC REGRESSION|                  (e)                      (e)                      (e)                      (e)             | 
|COCH-ARM / FISHERS |                  P=0.198N                 (e)                      (e)                      P=0.500N        | 
|ORDER RESTRICTED   |                  P=0.121N                 (e)                      (e)                      (e)             | 
|=================================================================================================================================| 
(a)  Number of tumor-bearing animals /  number of animals examined at site.                                                         
(b)  Number of tumor-bearing animals / Poly-3 number                                                                                
(d)  Observed incidence at terminal kill.                                                                                           
(f)  Beneath the control incidence are the P-values associated with the trend                                                       
test.  Beneath the dosed group incidence are the P-values corresponding to                                                          
pairwise comparisons between the controls and that dosed group.  The life                                                           
table analysis regards tumors in animals dying prior to  terminal kill as                                                           
 being (directly or indirectly) the cause of death.                                                                                 
Logistic regression is an alternative                                                                                               
 method for analyzing the incidence of non-fatal tumors. The Cochran-Armitage                                                       
and Fishers exact tests compare directly the overall incidence rates                                                                
For all tests a negative trend is indicated by N                                                                                    
(e)  Value of Statistic cannot be computed.                                                                                         
(g)  Poly-3 adjusted lifetime tumor incidence.                                                                                      
(I)  Interim sacrifice                                                                                                              
(T)  Terminal sacrifice                                                                                                             
#   Tumor rates based on number of animals necropsied.                                                                              
*   To the right of any statistical result, indicates significance at (P<=0.05).                                                    
**  To the right of any statistical result, indicates significance at (P<=0.01).