Table 1 Characteristics of primipara, by plant
|
Indiana Plant (n = 173) |
Massachusetts Plant (n = 1481) |
New York Plant (n = 941) | ||
|---|---|---|---|---|
| PCB production years a | 1957-1977 | 1938-1977 | 1948-1977 | |
| Estimated cumulative occupational PCB exposure, to estimated date of conception b | ||||
| Median | 4,868 | 193,320 | 20,988 | |
| Interquartile range | 2,460-8,510 | 84,672-397,512 | 8,700-54,120 | |
| Duration of employment (years), prior to estimated date of conception c | ||||
| Median | 2.0 | 2.6 | 2.0 | |
| Interquartile range | 1.1-2.7 | 1.3-4.6 | 1.1-3.5 | |
| Occupationally PCB exposed prior to estimated date of conception (n, %) | 86 (49.7%) | 1,034 (69.8%) | 386 (41.0%) | |
| Reproductive history reported by proxy | 2 (1.2%) | 190 (12.8%) | 82 (8.7%) | |
| Gender of offspring (n, %) | ||||
| Males | 85 (49.1%) | 724 (48.9%) | 484 (51.4%) | |
| Females | 88 (50.9%) | 757 (51.1%) | 457 (48.6%) | |
| Maternal race/ethnicitiy (n, %) | ||||
| White, non-Hispanic | 165 (95.4%) | 1,234 (83.3%) | 914 (97.1%) | |
| Non-white or multiracial | 8 (4.6%) | 247 (16.7%) | 27 (2.9%) | |
| Maternal education (n, %) | ||||
| Grade school only | 1 (0.6%) | 125 (8.6%) | 7 (0.8%) | |
| Some high school | 9 (5.2%) | 477 (32.7%) | 98 (10.5%) | |
| High school graduate or GED | 69 (39.9%) | 522 (35.8%) | 537(57.3%) | |
| Some college or professional training | 75 (43.4%) | 261 (17.9%) | 229(24.4%) | |
| College degree or higher | 19 (11%) | 74 (5.1%) | 67 (7.1%) | |
| Maternal Age (n, %) | ||||
| 18 or younger | 30 (17.3%) | 141 (9.5%) | 147 (15.6%) | |
| 19-24 | 100 (57.8%) | 910 (61.4%) | 550 (58.5%) | |
| 25-29 | 29 (16.8%) | 286 (19.3%) | 156 (16.6%) | |
| 30 or older | 14 (8.1%) | 144 (9.7%) | 88 (9.4%) | |