https://ntp.niehs.nih.gov/go/4897

TDMS Study 96007-01 Pathology Tables

NTP                                    STATISTICAL ANALYSIS OF NON-NEOPLASTIC LESIONS                          REPORT: PEIRPT10     
LAB: Battelle Columbus                        TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-126)                    DATE: 10/14/02       
EXPERIMENT: 96007 TEST: 01                                                                                     TIME: 15:42:56       
TEST TYPE:  CHRONIC                             CAGES FROM 0000 TO LAST CAGE                                   PAGE:       1        
CONT: N01-ES-75411                              ROUTE: GAVAGE                                                  NTP C#: 96007D       
PATHOLOGIST: MISSING                                                                                           CAS: 57465-28-8      
------------------------------------------------------------------------------------------------------------------------------------
                                                            53 WEEK SSAC                                                            
               REASONS FOR REMOVAL:    25017 Scheduled Sacrifice                                                                    
               REMOVAL DATE RANGE:     022599 022699                                                                                
               TREATMENT GROUPS:       INCLUDE 001    0 NG/KG                                                                       
                                       INCLUDE 002    10 NG/KG                                                                      
                                       INCLUDE 003    30 NG/KG                                                                      
                                       INCLUDE 004    100     NG/KG                                                                 
                                       INCLUDE 005    175     NG/KG                                                                 
                                       INCLUDE 006    300     NG/KG                                                                 
                                       INCLUDE 007    550     NG/KG                                                                 
                                       INCLUDE 008    1000    NG/KG                                                                 
NTP                                    STATISTICAL ANALYSIS OF NON-NEOPLASTIC LESIONS                          REPORT: PEIRPT10     
LAB: Battelle Columbus                        TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-126)                    DATE: 10/14/02       
EXPERIMENT: 96007 TEST: 01                                                                                     TIME: 15:42:56       
TEST TYPE:  CHRONIC                             CAGES FROM 0000 TO LAST CAGE                                                        
CONT: N01-ES-75411                              ROUTE: GAVAGE                                                  NTP C#: 96007D       
PATHOLOGIST: MISSING                                                                                           CAS: 57465-28-8      
SUMMARY OF STATISTICALLY SIGNIFICANT (P<=.05) RESULTS                                                                               
IN THE ANALYSIS OF   TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12                                                                    
===============================================================                                                                     
Female Rats                                                                                                                         
------------                                                                                                                        
Organ                                  Morphology                                                                                   
-----                                  ----------                                                                                   
Adrenal Cortex                         Degeneration Cystic                                                                          
                                       Hyperplasia                                                                                  
                                       Hypertrophy                                                                                  
Liver                                  Eosinophilic Focus                                                                           
                                       Fatty Change Diffuse                                                                         
                                       Hepatocyte, Multinucleate                                                                    
                                       Mixed Cell Focus                                                                             
                                       Pigmentation                                                                                 
                                       Toxic Hepatopathy                                                                            
Liver: Bile Duct                       Hyperplasia                                                                                  
Liver: Hepatocyte                      Hypertrophy                                                                                  
Lung: Alveolar Epithelium              Metaplasia Bronchiolar                                                                       
Pancreas: Acinus                       Vacuolization Cytoplasmic                                                                    
Thymus                                 Atrophy                                                                                      
Thyroid Gland: Follicular Cell         Hypertrophy                                                                                  
Uterus: Endometrium                    Hyperplasia Cystic                                                                           
===============================================================                                                                     
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 1       
Statistical Analysis of Non-neoplastic Lesions in        Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12     
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Adrenal Cortex                                                                                                                   | 
|     Degeneration Cystic                                                                                                         | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (13%)    0/8 (0%)     2/8 (25%)    | 
|POLY-3 RATE (b)    |     0/0.39       0/0.39       0/0.39       0/0.39       0/0.39       1/1.34       0/0.39       2/2.29       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         0.0%         0.0%         0.0%         74.6%        0.0%         87.2%        | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (12.5%)  0/8 (0%)     2/8 (25%)    | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          ---          ---          ---          365 (I)      ---          365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.011 *    (e)          (e)          (e)          (e)          P=0.500      (e)          P=0.232      | 
|POLY 3             |     P=0.003 **   (e)          (e)          (e)          (e)          P=0.173      (e)          P=0.069      | 
|POLY 1.5           |     P=0.005 **   (e)          (e)          (e)          (e)          P=0.228      (e)          P=0.093      | 
|POLY 6             |     P=0.003 **   (e)          (e)          (e)          (e)          P=0.159      (e)          P=0.064      | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.011 *    (e)          (e)          (e)          (e)          P=0.500      (e)          P=0.233      | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Adrenal Cortex                                                                                                                   | 
|     Hyperplasia                                                                                                                 | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     1/8 (13%)    1/8 (13%)    3/8 (38%)    1/8 (13%)    1/8 (13%)    2/8 (25%)    3/8 (38%)    | 
|POLY-3 RATE (b)    |     0/0.39       1/1.34       1/1.34       3/3.24       1/1.34       1/1.34       2/2.29       3/3.24       | 
|POLY-3 PERCENT (g) |     0.0%         74.6%        74.6%        92.5%        74.6%        74.6%        87.2%        92.5%        | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     1/8 (12.5%)  1/8 (12.5%)  3/8 (37.5%)  1/8 (12.5%)  1/8 (12.5%)  2/8 (25%)    3/8 (37.5%)  | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.080      P=0.500      P=0.500      P=0.107      P=0.500      P=0.500      P=0.232      P=0.107      | 
|POLY 3             |     P=0.064      P=0.173      P=0.173      P=0.022 *    P=0.173      P=0.173      P=0.069      P=0.022 *    | 
|POLY 1.5           |     P=0.067      P=0.228      P=0.228      P=0.031 *    P=0.228      P=0.228      P=0.093      P=0.031 *    | 
|POLY 6             |     P=0.063      P=0.159      P=0.159      P=0.020 *    P=0.159      P=0.159      P=0.064      P=0.020 *    | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.078      P=0.500      P=0.500      P=0.100      P=0.500      P=0.500      P=0.233      P=0.100      | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 2       
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Adrenal Cortex                                                                                                                   | 
|     Hypertrophy                                                                                                                 | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     5/8 (63%)    6/8 (75%)    3/8 (38%)    3/8 (38%)    1/8 (13%)    4/8 (50%)    5/8 (63%)    5/8 (63%)    | 
|POLY-3 RATE (b)    |     5/5.15       6/6.10       3/3.24       3/3.24       1/1.34       4/4.20       5/5.15       5/5.15       | 
|POLY-3 PERCENT (g) |     97.2%        98.4%        92.5%        92.5%        74.6%        95.4%        97.2%        97.2%        | 
|INT SACRIFICE 1 (c)|     5/8 (62.5%)  6/8 (75%)    3/8 (37.5%)  3/8 (37.5%)  1/8 (12.5%)  4/8 (50%)    5/8 (62.5%)  5/8 (62.5%)  | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.300      P=0.500      P=0.314N     P=0.314N     P=0.067N     P=0.500N     P=0.691      P=0.691      | 
|POLY 3             |     P=0.276      P=0.439      P=0.231N     P=0.231N     P=0.016N*    P=0.420N     P=0.623      P=0.623      | 
|POLY 1.5           |     P=0.280      P=0.450      P=0.247N     P=0.247N     P=0.021N*    P=0.435N     P=0.634      P=0.634      | 
|POLY 6             |     P=0.276      P=0.437      P=0.227N     P=0.227N     P=0.015N*    P=0.417N     P=0.621      P=0.621      | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.298      P=0.500      P=0.310N     P=0.310N     P=0.059N     P=0.500N     P=0.696N     P=0.696N     | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver                                                                                                                            | 
|     Basophilic Focus                                                                                                            | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     2/8 (25%)    2/8 (25%)    0/8 (0%)     1/8 (13%)    2/8 (25%)    0/8 (0%)     1/8 (13%)    2/8 (25%)    | 
|POLY-3 RATE (b)    |     2/2.29       2/2.29       0/0.39       1/1.34       2/2.29       0/0.39       1/1.34       2/2.29       | 
|POLY-3 PERCENT (g) |     87.2%        87.2%        0.0%         74.6%        87.2%        0.0%         74.6%        87.2%        | 
|INT SACRIFICE 1 (c)|     2/8 (25%)    2/8 (25%)    0/8 (0%)     1/8 (12.5%)  2/8 (25%)    0/8 (0%)     1/8 (12.5%)  2/8 (25%)    | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      365 (I)      ---          365 (I)      365 (I)      ---          365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.463      P=0.712      P=0.232N     P=0.500N     P=0.712      P=0.232N     P=0.500N     P=0.712      | 
|POLY 3             |     P=0.405      P=0.562      P=0.069N     P=0.314N     P=0.562      P=0.069N     P=0.314N     P=0.562      | 
|POLY 1.5           |     P=0.415      P=0.589      P=0.093N     P=0.348N     P=0.589      P=0.093N     P=0.348N     P=0.589      | 
|POLY 6             |     P=0.402      P=0.555      P=0.064N     P=0.304N     P=0.555      P=0.064N     P=0.304N     P=0.555      | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.463      P=0.715N     P=0.233N     P=0.500N     P=0.715N     P=0.233N     P=0.500N     P=0.715N     | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 3       
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver                                                                                                                            | 
|     Clear Cell Focus                                                                                                            | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     2/8 (25%)    1/8 (13%)    0/8 (0%)     | 
|POLY-3 RATE (b)    |     0/0.39       0/0.39       0/0.39       0/0.39       0/0.39       2/2.29       1/1.34       0/0.39       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         0.0%         0.0%         0.0%         87.2%        74.6%        0.0%         | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     2/8 (25%)    1/8 (12.5%)  0/8 (0%)     | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          ---          ---          ---          365 (I)      365 (I)      ---          | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.419      (e)          (e)          (e)          (e)          P=0.232      P=0.500      (e)          | 
|POLY 3             |     P=0.279      (e)          (e)          (e)          (e)          P=0.069      P=0.173      (e)          | 
|POLY 1.5           |     P=0.289      (e)          (e)          (e)          (e)          P=0.093      P=0.228      (e)          | 
|POLY 6             |     P=0.276      (e)          (e)          (e)          (e)          P=0.064      P=0.159      (e)          | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.419      (e)          (e)          (e)          (e)          P=0.233      P=0.500      (e)          | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver                                                                                                                            | 
|     Eosinophilic Focus                                                                                                          | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     2/8 (25%)    0/8 (0%)     1/8 (13%)    3/8 (38%)    | 
|POLY-3 RATE (b)    |     0/0.39       0/0.39       0/0.39       0/0.39       2/2.29       0/0.39       1/1.34       3/3.24       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         0.0%         0.0%         87.2%        0.0%         74.6%        92.5%        | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     2/8 (25%)    0/8 (0%)     1/8 (12.5%)  3/8 (37.5%)  | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          ---          ---          365 (I)      ---          365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.004 **   (e)          (e)          (e)          P=0.232      (e)          P=0.500      P=0.107      | 
|POLY 3             |     P<0.001 **   (e)          (e)          (e)          P=0.069      (e)          P=0.173      P=0.022 *    | 
|POLY 1.5           |     P<0.001 **   (e)          (e)          (e)          P=0.093      (e)          P=0.228      P=0.031 *    | 
|POLY 6             |     P<0.001 **   (e)          (e)          (e)          P=0.064      (e)          P=0.159      P=0.020 *    | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.003 **   (e)          (e)          (e)          P=0.233      (e)          P=0.500      P=0.100      | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 4       
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver                                                                                                                            | 
|     Fatty Change Diffuse                                                                                                        | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     2/8 (25%)    0/8 (0%)     1/8 (13%)    8/8 (100%)   | 
|POLY-3 RATE (b)    |     0/0.39       0/0.39       0/0.39       0/0.39       2/2.29       0/0.39       1/1.34       8/8.00       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         0.0%         0.0%         87.2%        0.0%         74.6%        100.0%       | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     2/8 (25%)    0/8 (0%)     1/8 (12.5%)  8/8 (100%)   | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          ---          ---          365 (I)      ---          365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P<0.001 **   (e)          (e)          (e)          P=0.232      (e)          P=0.500      P<0.001 **   | 
|POLY 3             |     P<0.001 **   (e)          (e)          (e)          P=0.069      (e)          P=0.173      P<0.001 **   | 
|POLY 1.5           |     P<0.001 **   (e)          (e)          (e)          P=0.093      (e)          P=0.228      P<0.001 **   | 
|POLY 6             |     P<0.001 **   (e)          (e)          (e)          P=0.064      (e)          P=0.159      P<0.001 **   | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P<0.001 **   (e)          (e)          (e)          P=0.233      (e)          P=0.500      P<0.001 **   | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver                                                                                                                            | 
|     Hepatocyte, Multinucleate                                                                                                   | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (13%)    3/8 (38%)    8/8 (100%)   | 
|POLY-3 RATE (b)    |     0/0.39       0/0.39       0/0.39       0/0.39       0/0.39       1/1.34       3/3.24       8/8.00       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         0.0%         0.0%         0.0%         74.6%        92.5%        100.0%       | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (12.5%)  3/8 (37.5%)  8/8 (100%)   | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          ---          ---          ---          365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P<0.001 **   (e)          (e)          (e)          (e)          P=0.500      P=0.107      P<0.001 **   | 
|POLY 3             |     P<0.001 **   (e)          (e)          (e)          (e)          P=0.173      P=0.022 *    P<0.001 **   | 
|POLY 1.5           |     P<0.001 **   (e)          (e)          (e)          (e)          P=0.228      P=0.031 *    P<0.001 **   | 
|POLY 6             |     P<0.001 **   (e)          (e)          (e)          (e)          P=0.159      P=0.020 *    P<0.001 **   | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P<0.001 **   (e)          (e)          (e)          (e)          P=0.500      P=0.100      P<0.001 **   | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 5       
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver                                                                                                                            | 
|     Inflammation                                                                                                                | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     8/8 (100%)   8/8 (100%)   8/8 (100%)   8/8 (100%)   8/8 (100%)   8/8 (100%)   8/8 (100%)   8/8 (100%)   | 
|POLY-3 RATE (b)    |     8/8.00       8/8.00       8/8.00       8/8.00       8/8.00       8/8.00       8/8.00       8/8.00       | 
|POLY-3 PERCENT (g) |     100.0%       100.0%       100.0%       100.0%       100.0%       100.0%       100.0%       100.0%       | 
|INT SACRIFICE 1 (c)|     8/8 (100%)   8/8 (100%)   8/8 (100%)   8/8 (100%)   8/8 (100%)   8/8 (100%)   8/8 (100%)   8/8 (100%)   | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|POLY 3             |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|POLY 1.5           |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|POLY 6             |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver                                                                                                                            | 
|     Mixed Cell Focus                                                                                                            | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     4/8 (50%)    5/8 (63%)    3/8 (38%)    6/8 (75%)    6/8 (75%)    6/8 (75%)    8/8 (100%)   8/8 (100%)   | 
|POLY-3 RATE (b)    |     4/4.20       5/5.15       3/3.24       6/6.10       6/6.10       6/6.10       8/8.00       8/8.00       | 
|POLY-3 PERCENT (g) |     95.4%        97.2%        92.5%        98.4%        98.4%        98.4%        100.0%       100.0%       | 
|INT SACRIFICE 1 (c)|     4/8 (50%)    5/8 (62.5%)  3/8 (37.5%)  6/8 (75%)    6/8 (75%)    6/8 (75%)    8/8 (100%)   8/8 (100%)   | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.002 **   P=0.500      P=0.500N     P=0.309      P=0.309      P=0.309      P=0.047 *    P=0.047 *    | 
|POLY 3             |     P<0.001 **   P=0.420      P=0.398N     P=0.243      P=0.243      P=0.243      P=0.013 *    P=0.013 *    | 
|POLY 1.5           |     P<0.001 **   P=0.435      P=0.416N     P=0.255      P=0.255      P=0.255      P=0.015 *    P=0.015 *    | 
|POLY 6             |     P<0.001 **   P=0.417      P=0.393N     P=0.240      P=0.240      P=0.240      P=0.013 *    P=0.013 *    | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.002 **   P=0.500      P=0.500N     P=0.304      P=0.304      P=0.304      P=0.038 *    P=0.038 *    | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 6       
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver                                                                                                                            | 
|     Pigmentation                                                                                                                | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/8 (0%)     3/8 (38%)    8/8 (100%)   7/8 (88%)    8/8 (100%)   8/8 (100%)   8/8 (100%)   | 
|POLY-3 RATE (b)    |     0/0.39       0/0.39       3/3.24       8/8.00       7/7.05       8/8.00       8/8.00       8/8.00       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         92.5%        100.0%       99.3%        100.0%       100.0%       100.0%       | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/8 (0%)     3/8 (37.5%)  8/8 (100%)   7/8 (87.5%)  8/8 (100%)   8/8 (100%)   8/8 (100%)   | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P<0.001 **   (e)          P=0.107      P<0.001 **   P=0.002 **   P<0.001 **   P<0.001 **   P<0.001 **   | 
|POLY 3             |     P<0.001 **   (e)          P=0.022 *    P<0.001 **   P<0.001 **   P<0.001 **   P<0.001 **   P<0.001N**   | 
|POLY 1.5           |     P<0.001 **   (e)          P=0.031 *    P<0.001 **   P<0.001 **   P<0.001 **   P<0.001 **   P<0.001N**   | 
|POLY 6             |     P<0.001 **   (e)          P=0.020 *    P<0.001 **   P<0.001 **   P<0.001 **   P<0.001 **   P<0.001N**   | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P<0.001 **   (e)          P=0.100      P<0.001 **   P<0.001 **   P<0.001 **   P<0.001 **   P<0.001 **   | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver                                                                                                                            | 
|     Toxic Hepatopathy                                                                                                           | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (13%)    0/8 (0%)     4/8 (50%)    8/8 (100%)   | 
|POLY-3 RATE (b)    |     0/0.39       0/0.39       0/0.39       0/0.39       1/1.34       0/0.39       4/4.20       8/8.00       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         0.0%         0.0%         74.6%        0.0%         95.4%        100.0%       | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (12.5%)  0/8 (0%)     4/8 (50%)    8/8 (100%)   | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          ---          ---          365 (I)      ---          365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P<0.001 **   (e)          (e)          (e)          P=0.500      (e)          P=0.047 *    P<0.001 **   | 
|POLY 3             |     P<0.001 **   (e)          (e)          (e)          P=0.173      (e)          P=0.005 **   P<0.001 **   | 
|POLY 1.5           |     P<0.001 **   (e)          (e)          (e)          P=0.228      (e)          P=0.007 **   P<0.001 **   | 
|POLY 6             |     P<0.001 **   (e)          (e)          (e)          P=0.159      (e)          P=0.004 **   P<0.001 **   | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P<0.001 **   (e)          (e)          (e)          P=0.500      (e)          P=0.038 *    P<0.001 **   | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 7       
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver: Bile Duct                                                                                                                 | 
|     Hyperplasia                                                                                                                 | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (13%)    4/8 (50%)    6/8 (75%)    | 
|POLY-3 RATE (b)    |     0/0.39       0/0.39       0/0.39       0/0.39       0/0.39       1/1.34       4/4.20       6/6.10       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         0.0%         0.0%         0.0%         74.6%        95.4%        98.4%        | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (12.5%)  4/8 (50%)    6/8 (75%)    | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          ---          ---          ---          365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P<0.001 **   (e)          (e)          (e)          (e)          P=0.500      P=0.047 *    P=0.006 **   | 
|POLY 3             |     P<0.001 **   (e)          (e)          (e)          (e)          P=0.173      P=0.005 **   P<0.001 **   | 
|POLY 1.5           |     P<0.001 **   (e)          (e)          (e)          (e)          P=0.228      P=0.007 **   P<0.001 **   | 
|POLY 6             |     P<0.001 **   (e)          (e)          (e)          (e)          P=0.159      P=0.004 **   P<0.001 **   | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P<0.001 **   (e)          (e)          (e)          (e)          P=0.500      P=0.038 *    P=0.003 **   | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Liver: Hepatocyte                                                                                                                | 
|     Hypertrophy                                                                                                                 | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     3/8 (38%)    2/8 (25%)    5/8 (63%)    6/8 (75%)    7/8 (88%)    8/8 (100%)   8/8 (100%)   | 
|POLY-3 RATE (b)    |     0/0.39       3/3.24       2/2.29       5/5.15       6/6.10       7/7.05       8/8.00       8/8.00       | 
|POLY-3 PERCENT (g) |     0.0%         92.5%        87.2%        97.2%        98.4%        99.3%        100.0%       100.0%       | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     3/8 (37.5%)  2/8 (25%)    5/8 (62.5%)  6/8 (75%)    7/8 (87.5%)  8/8 (100%)   8/8 (100%)   | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P<0.001 **   P=0.107      P=0.232      P=0.018 *    P=0.006 **   P=0.002 **   P<0.001 **   P<0.001 **   | 
|POLY 3             |     P<0.001 **   P=0.022 *    P=0.069      P<0.001 **   P<0.001 **   P<0.001 **   P<0.001 **   P<0.001N**   | 
|POLY 1.5           |     P<0.001 **   P=0.031 *    P=0.093      P<0.001 **   P<0.001 **   P<0.001 **   P<0.001 **   P<0.001N**   | 
|POLY 6             |     P<0.001 **   P=0.020 *    P=0.064      P<0.001 **   P<0.001 **   P<0.001 **   P<0.001 **   P<0.001N**   | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P<0.001 **   P=0.100      P=0.233      P=0.013 *    P=0.003 **   P<0.001 **   P<0.001 **   P<0.001 **   | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 8       
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Lung                                                                                                                             | 
|     Infiltration Cellular Histiocyte                                                                                            | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     3/8 (38%)    4/8 (50%)    6/8 (75%)    5/8 (63%)    4/8 (50%)    2/8 (25%)    3/8 (38%)    6/8 (75%)    | 
|POLY-3 RATE (b)    |     3/3.24       4/4.20       6/6.10       5/5.15       4/4.20       2/2.29       3/3.24       6/6.10       | 
|POLY-3 PERCENT (g) |     92.5%        95.4%        98.4%        97.2%        95.4%        87.2%        92.5%        98.4%        | 
|INT SACRIFICE 1 (c)|     3/8 (37.5%)  4/8 (50%)    6/8 (75%)    5/8 (62.5%)  4/8 (50%)    2/8 (25%)    3/8 (37.5%)  6/8 (75%)    | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.348      P=0.500      P=0.165      P=0.314      P=0.500      P=0.500N     P=0.691      P=0.165      | 
|POLY 3             |     P=0.344      P=0.398      P=0.100      P=0.231      P=0.398      P=0.366N     P=0.578      P=0.100      | 
|POLY 1.5           |     P=0.345      P=0.416      P=0.111      P=0.247      P=0.416      P=0.391N     P=0.598      P=0.111      | 
|POLY 6             |     P=0.344      P=0.393      P=0.098      P=0.227      P=0.393      P=0.360N     P=0.573      P=0.098      | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.346      P=0.500      P=0.157      P=0.310      P=0.500      P=0.500N     P=0.696N     P=0.157      | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Lung: Alveolar Epithelium                                                                                                        | 
|     Metaplasia Bronchiolar                                                                                                      | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (13%)    1/8 (13%)    2/8 (25%)    6/8 (75%)    | 
|POLY-3 RATE (b)    |     0/0.39       0/0.39       0/0.39       0/0.39       1/1.34       1/1.34       2/2.29       6/6.10       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         0.0%         0.0%         74.6%        74.6%        87.2%        98.4%        | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (12.5%)  1/8 (12.5%)  2/8 (25%)    6/8 (75%)    | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          ---          ---          365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P<0.001 **   (e)          (e)          (e)          P=0.500      P=0.500      P=0.232      P=0.006 **   | 
|POLY 3             |     P<0.001 **   (e)          (e)          (e)          P=0.173      P=0.173      P=0.069      P<0.001 **   | 
|POLY 1.5           |     P<0.001 **   (e)          (e)          (e)          P=0.228      P=0.228      P=0.093      P<0.001 **   | 
|POLY 6             |     P<0.001 **   (e)          (e)          (e)          P=0.159      P=0.159      P=0.064      P<0.001 **   | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P<0.001 **   (e)          (e)          (e)          P=0.500      P=0.500      P=0.233      P=0.003 **   | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 9       
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Ovary                                                                                                                            | 
|     Atrophy                                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     8/8 (100%)   7/8 (88%)    7/8 (88%)    8/8 (100%)   6/8 (75%)    8/8 (100%)   7/8 (88%)    7/8 (88%)    | 
|POLY-3 RATE (b)    |     8/8.00       7/7.05       7/7.05       8/8.00       6/6.10       8/8.00       7/7.05       7/7.05       | 
|POLY-3 PERCENT (g) |     100.0%       99.3%        99.3%        100.0%       98.4%        100.0%       99.3%        99.3%        | 
|INT SACRIFICE 1 (c)|     8/8 (100%)   7/8 (87.5%)  7/8 (87.5%)  8/8 (100%)   6/8 (75%)    8/8 (100%)   7/8 (87.5%)  7/8 (87.5%)  | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.453N     P=0.500N     P=0.500N     (e)          P=0.232N     (e)          P=0.500N     P=0.500N     | 
|POLY 3             |     P=0.440N     P=0.476N     P=0.476N     (e)          P=0.191N     (e)          P=0.476N     P=0.476N     | 
|POLY 1.5           |     P=0.443N     P=0.480N     P=0.480N     (e)          P=0.197N     (e)          P=0.480N     P=0.480N     | 
|POLY 6             |     P=0.440N     P=0.478N     P=0.478N     (e)          P=0.191N     (e)          P=0.478N     P=0.478N     | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.452N     P=0.500N     P=0.500N     (e)          P=0.233N     (e)          P=0.500N     P=0.500N     | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Pancreas: Acinus                                                                                                                 | 
|     Vacuolization Cytoplasmic                                                                                                   | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/8 (0%)     0/7 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (13%)    6/8 (75%)    | 
|POLY-3 RATE (b)    |     0/0.39       0/0.39       0/0.34       0/0.39       0/0.39       0/0.39       1/1.34       6/6.10       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         0.0%         0.0%         0.0%         0.0%         74.6%        98.4%        | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/8 (0%)     0/7 (0%)     0/8 (0%)     0/8 (0%)     0/8 (0%)     1/8 (12.5%)  6/8 (75%)    | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          ---          ---          ---          ---          365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P<0.001 **   (e)          (e)          (e)          (e)          (e)          P=0.500      P=0.006 **   | 
|POLY 3             |     P<0.001 **   (e)          (e)          (e)          (e)          (e)          P=0.173      P<0.001 **   | 
|POLY 1.5           |     P<0.001 **   (e)          (e)          (e)          (e)          (e)          P=0.228      P<0.001 **   | 
|POLY 6             |     P<0.001 **   (e)          (e)          (e)          (e)          (e)          P=0.159      P<0.001 **   | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P<0.001 **   (e)          (e)          (e)          (e)          (e)          P=0.500      P=0.003 **   | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 10      
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Pituitary Gland: Pars Distalis                                                                                                   | 
|     Hyperplasia                                                                                                                 | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     2/8 (25%)    0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/8 (0%)     | 
|POLY-3 RATE (b)    |     2/2.29       0/0.00       0/0.00       0/0.00       0/0.00       0/0.00       0/0.00       0/0.39       | 
|POLY-3 PERCENT (g) |     87.2%        0.0%         0.0%         0.0%         0.0%         0.0%         0.0%         0.0%         | 
|INT SACRIFICE 1 (c)|     2/8 (25%)    0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/8 (0%)     | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      ---          ---          ---          ---          ---          ---          ---          | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.128N     P=1.000N     P=1.000      P=1.000N     P=1.000N     P=1.000N     P=1.000N     P=0.232N     | 
|POLY 3             |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          P=0.069N     | 
|POLY 1.5           |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          P=0.093N     | 
|POLY 6             |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          P=0.064N     | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.121N     P=1.000      P=1.000      P=1.000      P=1.000      P=1.000      P=1.000      P=0.233N     | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Spleen                                                                                                                           | 
|     Pigmentation                                                                                                                | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     8/8 (100%)   0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     1/1 (100%)   8/8 (100%)   | 
|POLY-3 RATE (b)    |     8/8.00       0/0.00       0/0.00       0/0.00       0/0.00       0/0.00       1/1.00       8/8.00       | 
|POLY-3 PERCENT (g) |     100.0%       0.0%         0.0%         0.0%         0.0%         0.0%         100.0%       100.0%       | 
|INT SACRIFICE 1 (c)|     8/8 (100%)   0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     1/1 (100%)   8/8 (100%)   | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      ---          ---          ---          ---          ---          365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|POLY 3             |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|POLY 1.5           |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|POLY 6             |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 11      
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Thymus                                                                                                                           | 
|     Atrophy                                                                                                                     | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     7/8 (88%)    5/8 (63%)    6/8 (75%)    5/8 (63%)    5/7 (71%)    7/8 (88%)    8/8 (100%)   7/7 (100%)   | 
|POLY-3 RATE (b)    |     7/7.05       5/5.15       6/6.10       5/5.15       5/5.10       7/7.05       8/8.00       7/7.00       | 
|POLY-3 PERCENT (g) |     99.3%        97.2%        98.4%        97.2%        98.1%        99.3%        100.0%       100.0%       | 
|INT SACRIFICE 1 (c)|     7/8 (87.5%)  5/8 (62.5%)  6/8 (75%)    5/8 (62.5%)  5/7 (71.4%)  7/8 (87.5%)  8/8 (100%)   7/7 (100%)   | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.031 *    P=0.288N     P=0.500N     P=0.288N     P=0.450N     P=0.768      P=0.500      P=0.527      | 
|POLY 3             |     P=0.030 *    P=0.237N     P=0.456N     P=0.237N     P=0.401N     P=0.735      P=0.476      P=0.505      | 
|POLY 1.5           |     P=0.030 *    P=0.247N     P=0.464N     P=0.247N     P=0.410N     P=0.739      P=0.480      P=0.508      | 
|POLY 6             |     P=0.030 *    P=0.235N     P=0.456N     P=0.235N     P=0.400N     P=0.735      P=0.478      P=0.506      | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.030 *    P=0.285N     P=0.500N     P=0.285N     P=0.446N     P=0.767N     P=0.500      P=0.533      | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Thyroid Gland: C-Cell                                                                                                            | 
|     Hyperplasia                                                                                                                 | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     2/8 (25%)    0/3 (0%)     0/1 (0%)     0/3 (0%)     0/3 (0%)     0/3 (0%)     0/2 (0%)     0/8 (0%)     | 
|POLY-3 RATE (b)    |     2/2.29       0/0.15       0/0.05       0/0.15       0/0.15       0/0.15       0/0.10       0/0.39       | 
|POLY-3 PERCENT (g) |     87.2%        0.0%         0.0%         0.0%         0.0%         0.0%         0.0%         0.0%         | 
|INT SACRIFICE 1 (c)|     2/8 (25%)    0/3 (0%)     0/1 (0%)     0/3 (0%)     0/3 (0%)     0/3 (0%)     0/2 (0%)     0/8 (0%)     | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      ---          ---          ---          ---          ---          ---          ---          | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.200N     P=0.470N     P=0.748N     P=0.470N     P=0.470N     P=0.470N     P=0.574N     P=0.232N     | 
|POLY 3             |     P=0.117N     P=0.194N     P=0.326N     P=0.194N     P=0.194N     P=0.194N     P=0.247N     P=0.069N     | 
|POLY 1.5           |     P=0.131N     P=0.240N     P=0.402N     P=0.240N     P=0.240N     P=0.240N     P=0.303N     P=0.093N     | 
|POLY 6             |     P=0.113N     P=0.183N     P=0.306N     P=0.183N     P=0.183N     P=0.183N     P=0.233N     P=0.064N     | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.197N     P=0.509N     P=0.778N     P=0.509N     P=0.509N     P=0.509N     P=0.622N     P=0.233N     | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 12      
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Thyroid Gland: Follicular Cell                                                                                                   | 
|     Hypertrophy                                                                                                                 | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     1/8 (13%)    3/3 (100%)   1/1 (100%)   3/3 (100%)   3/3 (100%)   3/3 (100%)   2/2 (100%)   5/8 (63%)    | 
|POLY-3 RATE (b)    |     1/1.34       3/3.00       1/1.00       3/3.00       3/3.00       3/3.00       2/2.00       5/5.15       | 
|POLY-3 PERCENT (g) |     74.6%        100.0%       100.0%       100.0%       100.0%       100.0%       100.0%       97.2%        | 
|INT SACRIFICE 1 (c)|     1/8 (12.5%)  3/3 (100%)   1/1 (100%)   3/3 (100%)   3/3 (100%)   3/3 (100%)   2/2 (100%)   5/8 (62.5%)  | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.396      P=0.029 *    P=0.252      P=0.029 *    P=0.029 *    P=0.029 *    P=0.070      P=0.067      | 
|POLY 3             |     P=0.316      P<0.001 **   P=0.032 *    P<0.001 **   P<0.001 **   P<0.001 **   P<0.001 **   P=0.016 *    | 
|POLY 1.5           |     P=0.316      P<0.001 **   P=0.081      P<0.001 **   P<0.001 **   P<0.001 **   P=0.003 **   P=0.021 *    | 
|POLY 6             |     P=0.320      P<0.001 **   P=0.023 *    P<0.001 **   P<0.001 **   P<0.001 **   P<0.001 **   P=0.015 *    | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.394      P=0.024 *    P=0.222      P=0.024 *    P=0.024 *    P=0.024 *    P=0.067      P=0.059      | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Uterus                                                                                                                           | 
|     Inflammation                                                                                                                | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     3/8 (38%)    0/0 (0%)     2/2 (100%)   0/0 (0%)     0/0 (0%)     2/2 (100%)   0/0 (0%)     1/8 (13%)    | 
|POLY-3 RATE (b)    |     3/3.24       0/0.00       2/2.00       0/0.00       0/0.00       2/2.00       0/0.00       1/1.34       | 
|POLY-3 PERCENT (g) |     92.5%        0.0%         100.0%       0.0%         0.0%         100.0%       0.0%         74.6%        | 
|INT SACRIFICE 1 (c)|     3/8 (37.5%)  0/0 (0%)     2/2 (100%)   0/0 (0%)     0/0 (0%)     2/2 (100%)   0/0 (0%)     1/8 (12.5%)  | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      ---          365 (I)      ---          ---          365 (I)      ---          365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.068N     P=1.000N     P=0.227      P=1.000N     P=1.000N     P=0.227      P=1.000N     P=0.288N     | 
|POLY 3             |     (e)          (e)          P=0.134      (e)          (e)          P=0.134      (e)          P=0.156N     | 
|POLY 1.5           |     (e)          (e)          P=0.157      (e)          (e)          P=0.157      (e)          P=0.180N     | 
|POLY 6             |     (e)          (e)          P=0.128      (e)          (e)          P=0.128      (e)          P=0.149N     | 
|LOGISTIC REGRESSION|     (e)          (e)          P=0.215      (e)          (e)          P=0.215      (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.063N     P=1.000      P=0.222      P=1.000      P=1.000      P=0.222      P=1.000      P=0.285N     | 
|=================================================================================================================================| 
       Date:  10/14/02                           EXPERIMENT: 96007 TEST: 01                                            Page 13      
Statistical Analysis of Non-neoplastic Lesions in       Rats(SPRAGUE-DAWLEY)  -    TOXIC EQUIVALENCY FACTOR EVALUATION (PCB-12      
                                         Terminal Sacrifice at 143 weeks                                                            
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Uterus                                                                                                                           | 
|     Metaplasia                                                                                                                  | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     8/8 (100%)   0/0 (0%)     1/2 (50%)    0/0 (0%)     0/0 (0%)     2/2 (100%)   0/0 (0%)     7/8 (88%)    | 
|POLY-3 RATE (b)    |     8/8.00       0/0.00       1/1.05       0/0.00       0/0.00       2/2.00       0/0.00       7/7.05       | 
|POLY-3 PERCENT (g) |     100.0%       0.0%         95.4%        0.0%         0.0%         100.0%       0.0%         99.3%        | 
|INT SACRIFICE 1 (c)|     8/8 (100%)   0/0 (0%)     1/2 (50%)    0/0 (0%)     0/0 (0%)     2/2 (100%)   0/0 (0%)     7/8 (87.5%)  | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     365 (I)      ---          365 (I)      ---          ---          365 (I)      ---          365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.538N     (e)          P=0.227N     (e)          (e)          (e)          (e)          P=0.500N     | 
|POLY 3             |     (e)          (e)          P=0.050N     (e)          (e)          (e)          (e)          P=0.476N     | 
|POLY 1.5           |     (e)          (e)          P=0.066N     (e)          (e)          (e)          (e)          P=0.480N     | 
|POLY 6             |     (e)          (e)          P=0.047N*    (e)          (e)          (e)          (e)          P=0.478N     | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.538N     (e)          P=0.200N     (e)          (e)          (e)          (e)          P=0.500N     | 
|=================================================================================================================================| 
|                   |                                                                                                             | 
|                   |                                                      Females                                                | 
|Dose               |     0 NG/KG      10 NG/KG     30 NG/KG     100          175          300          550          1000         | 
|                   |                                            NG/KG        NG/KG        NG/KG        NG/KG        NG/KG        | 
|=================================================================================================================================| 
|                                                                                                                                 | 
|Uterus: Endometrium                                                                                                              | 
|     Hyperplasia Cystic                                                                                                          | 
|                                                                                                                                 | 
|                                                                                                                                 | 
|---------------------------------------------------------------------------------------------------------------------------------| 
|LESION RATES       |                                                                                                             | 
|-----------        |                                                                                                             | 
|OVERALL (a)        |     0/8 (0%)     0/0 (0%)     2/2 (100%)   0/0 (0%)     0/0 (0%)     1/2 (50%)    0/0 (0%)     1/8 (13%)    | 
|POLY-3 RATE (b)    |     0/0.39       0/0.00       2/2.00       0/0.00       0/0.00       1/1.05       0/0.00       1/1.34       | 
|POLY-3 PERCENT (g) |     0.0%         0.0%         100.0%       0.0%         0.0%         95.4%        0.0%         74.6%        | 
|INT SACRIFICE 1 (c)|     0/8 (0%)     0/0 (0%)     2/2 (100%)   0/0 (0%)     0/0 (0%)     1/2 (50%)    0/0 (0%)     1/8 (12.5%)  | 
|TERMINAL (d)       |     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     0/0 (0%)     | 
|FIRST INCIDENCE    |     ---          ---          365 (I)      ---          ---          365 (I)      ---          365 (I)      | 
|-------------------|                                                                                                             | 
|STATISTICAL TESTS  |                                                                                                             | 
|-------------------|                                                                                                             | 
|LIFE TABLE         |     P=0.432N     (e)          P=0.020 *    (e)          (e)          P=0.227      (e)          P=0.500      | 
|POLY 3             |     (e)          (e)          P=0.022N*    (e)          (e)          P=0.008 **   (e)          P=0.173      | 
|POLY 1.5           |     (e)          (e)          P=0.022N*    (e)          (e)          P=0.025 *    (e)          P=0.228      | 
|POLY 6             |     (e)          (e)          P=0.022N*    (e)          (e)          P=0.006 **   (e)          P=0.159      | 
|LOGISTIC REGRESSION|     (e)          (e)          (e)          (e)          (e)          (e)          (e)          (e)          | 
|COCH-ARM / FISHERS |     P=0.431N     (e)          P=0.022 *    (e)          (e)          P=0.200      (e)          P=0.500      | 
|=================================================================================================================================| 
(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).