Table 1 Distribution of Selected Characteristics by Phase 2 Participation Status
Characteristic | Participant (N = 694) | Non-Participant (N = 818) |
|---|---|---|
PCE exposure status | ||
 Both pre and postnatal exposure | 363 (52.3%) | 468 (57.2%) |
 Only postnatal exposure | 76 (11.0%) | 58 (7.1%) |
 Unexposed | 255 (36.7%) | 292 (35.7%) |
Age (Phase 2, mean, sd) | 41 (4) | 40 (4) |
White race | 688 (99.1%) | 802 (98.0%) |
Sex | ||
 Male | 242 (34.9%) | 360 (44.0%) |
 Female | 452 (65.1%) | 458 (56.0%) |
Ever smoked on a regular basis (Phase 1 data) | 202 (29.4%) | 343 (42.3%) |
Missing | 6 | 8 |
Drank 5 + (men)/4 + (women) drinks* per day, past 30 days (Phase 1 data) | 80 (11.8%) | 147 (18.7%) |
Missing | 16 | 32 |
Any drug use** (Phase 1 data) | 230 (33.1%) | 351 (42.9%) |
Mother’s age at subject’s birth (Mean, SD) | 27 (4) | 27 (5) |
Mother’s educational level at subject’s birth | ||
 High school graduate or less | 230 (33.2%) | 340 (41.7%) |
 Some college | 210 (30.3%) | 254 (31.1%) |
 4 year college graduate or higher | 253 (36.5%) | 222 (27.2%) |
 Missing | 1 | 2 |
Father’s occupation at subject’s birth | ||
 White collar | 371 (53.9%) | 370 (46.0%) |
 Blue collar | 211 (30.7%) | 285 (35.4%) |
 Other | 106 (15.4%) | 149 (18.5%) |
 Missing | 6 | 14 |
Subject’s birth weight (Mean, SD) | 3423 (524) | 3438 (507) |
Missing | 60 | 44 |
Subject’s gestational age (weeks) (Mean, SD) | 40 (2) | 40 (2) |
Missing | 29 | 60 |
Mother received prenatal care during subject’s pregnancy | 663 (99.8%) | 764 (99.6%) |
Missing | 30 | 51 |