Table I.
Baseline characteristics.
| Controls |
Cases |
ORa | 95% CI | |||
|---|---|---|---|---|---|---|
| n | (%) | n | (%) | |||
| Maternal characteristics | ||||||
| Race/Ethnicity | ||||||
| White | 273 | (84.5) | 334 | (75.6) | Ref | |
| Black | 18 | (5.6) | 18 | (4.1) | 0.65 | 0.31–1.33 |
| Hispanic | 15 | (4.6) | 55 | (12.4) | 2.62 | 1.42–4.83 |
| Other | 17 | (5.3) | 35 | (7.9) | 1.66 | 0.88–3.11 |
| Education | ||||||
| ≤High school | 91 | (28.2) | 149 | (33.7) | 1.46 | 1.00–2.13 |
| Some post-HS | 112 | (34.7) | 125 | (28.3) | Ref | |
| College graduate | 120 | (37.2) | 168 | (38.0) | 1.10 | 0.76–1.58 |
| Household income | ||||||
| ≤ $30 000 | 95 | (29.6) | 157 | (35.8) | Ref | |
| $30 001–$75 000 | 145 | (45.2) | 189 | (43.1) | 0.80 | 0.56–1.13 |
| >$75 000 | 81 | (25.2) | 93 | (21.2) | 0.56 | 0.37–0.84 |
| Smoking during pregnancy | ||||||
| Yes (at least 1 cig/day) | 65 | (20.1) | 74 | (16.7) | 0.90 | 0.61–1.32 |
| No | 258 | (79.9) | 368 | (83.3) | Ref | |
| Child characteristics | ||||||
| Gender | ||||||
| Male | 156 | (48.1) | 218 | (49.2) | Ref | |
| Female | 168 | (51.9) | 225 | (50.8) | 0.97 | 0.72–1.31 |
| Gestational age (weeks) | ||||||
| <37 | 24 | (7.4) | 32 | (7.2) | 0.79 | 0.44–1.43 |
| 37–40 | 259 | (79.9) | 360 | (81.3) | Ref | |
| ≥41 | 41 | (12.7) | 51 | (11.5) | 1.03 | 0.65–1.62 |
| Birthweight (g) | ||||||
| Mean (SD) | 3436.33 | (591.76) | 3477.26 | (572.45) | 1.12b | 0.98–1.28 |
aLogistic regression models were adjusted for year of birth (quartiles).
bPer 500 g increase.