Table 1.
Characteristics of study subjects (N = 7,711).
| Variable | Obese (n = 4492) |
Nonobese (n = 3219) |
P |
|---|---|---|---|
| Maternal age, mean (sd) | 25.4 (5.9) | 24.2 (6.2) | <0.001 |
| Gestational age in weeks, mean (sd) | 39.0 (1.2) | 38.9 (1.2) | <0.001 |
| Race, n (%) | |||
| Black | 3,380 (75.2) | 2,135 (66.3) | <0.001 |
| Caucasian | 801 (17.8) | 710 (22.1) | |
| Primiparous, n (%) | 1,517 (33.8) | 1,383 (43.0) | <0.001 |
| Vaginal delivery, n (%) | 2,875 (64.0) | 2505 (77.8) | <0.001 |
| Smoking, n (%) | 794 (17.7) | 594 (18.5) | 0.381 |
| Alcohol, n (%) | 51 (1.1) | 52 (1.6) | 0.070 |
| Illicit drug use, n (%) | 414 (9.2) | 356 (11.1) | 0.008 |
| Diabetes mellitus, n (%) | 134 (3.0) | 15 (0.47) | <0.001 |
| Chronic hypertension, n (%) | 212 (4.7) | 37 (1.2) | <0.001 |
sd: standard deviation.