Table 1.
Demographic Information by Date of Enrollment
| Demographic Characteristics | Entire Cohort n = 775 |
<14 weeks n = 393 |
≥14 weeks n = 382 |
p value* |
|---|---|---|---|---|
| Mean maternal age | 28 ± 6.5 | 28.5 ± 5.8 | 27.6 ± 6.3 | |
| Mean maternal weight at enrollment (lbs) | 162 ± 44.7 | 162.1 ± 39.7 | 162.1 ± 43.8 | 0.98 |
| Maternal Race | ||||
| White | 374 (48%) | 204 (52%) | 170 (45%) | 0.02 |
| Black | 360 (46%) | 166 (42%) | 194 (51%) | 0.03 |
| Other | 41 (6%) | 23 (6%) | 18 (5%) | |
| Married | 394 (51%) | 215 (55%) | 179 (47%) | 0.03 |
| Privately Insured | 358 (46%) | 193 (49%) | 165 (43%) | 0.10 |
| Eligible for WIC/Food Stamps | 171 (22%) | 83 (21%) | 88 (23%) | 0.52 |
| Primigravida | 308 (40%) | 157 (40%) | 151 (40%) | 0.90 |
| Multiparous with previous preterm delivery | 133 (28%) | 66 (17%) | 67 (18%) | 0.78 |
| Sexually transmitted disease | 97 (13%) | 54 (14%) | 43 (11%) | 0.30 |
| Smoking during current pregnancy | 132 (17%) | 65 (16%) | 67 (18%) | 0.71 |
| Alcohol use during current pregnancy | 122 (16%) | 58 (15%) | 64 (17%) | 0.45 |
*
for comparison between patients < 14 weeks gestation and ≥ 14 weeks gestation