TABLE 3.
Clinical and demographic characteristics of women across 3-category body mass index class
| Description | Value | BMI < 25 N = 217 |
BMI 25<30 N = 96 |
BMI ≥30 N = 130 |
P value |
|---|---|---|---|---|---|
| No. of previous preterm deliveries | Mean (SE) | 1.50 (0.06) | 1.46 (0.08) | 1.43 (0.07) | .711 |
| >1 Previous preterm delivery | >1 | 73 (33.64) | 33 (34.38) | 40 (30.77) | .813 |
| Maternal age, y | Mean (SE) | 26.1 (0.38) | 26.2 (0.60) | 26.6 (0.46) | .638 |
| Race, N (%) | Black | 120 (55.30) | 51 (53.13) | 95 (73.08) | .009 |
| Caucasian | 65 (29.95) | 27 (28.13) | 16 (12.31) | ||
| Hispanic | 28 (12.90) | 16 (16.67) | 17 (13.08) | ||
| Other/unknown | 4 (1.84) | 2 (2.08) | 2 (1.54) | ||
| Marital status, N (%) | Married/living with partner | 110 (50.69) | 46 (47.92) | 62 (47.69) | .873 |
| Divorced/widowed/separated | 25 (11.52) | 10 (10.42) | 12 (9.23) | ||
| Never married | 82 (37.79) | 40 (41.67) | 56 (43.08) | ||
| Years of school completed | Mean (SE) | 12.1 (0.15) | 11.5 (0.25) | 11.6 (0.20) | .086 |
| Smoked during pregnancy (baseline), N (%) | Yes | 49 (22.58) | 24 (25.00) | 22 (16.92) | .292 |
| Alcohol during pregnancy (baseline), N (%) | Yes | 15 (6.91) | 9 (9.38) | 12 (9.23) | .657 |
| Illicit drug use during pregnancy (baseline), N (%) | Yes | 6 (2.76) | 5 (5.21) | 4 (3.08) | .53 |
| Gestational age at randomization, wk | Mean (SE) | 18.8 (0.10) | 18.9 (0.14) | 18.9 (0.13) | .835 |
| PTB <37 wk, N (%) | Yes | 100 (46.08) | 44 (45.83) | 44 (33.85) | .062 |
| Spontaneous PTB <37 wk, N (%) | Yes | 88 (40.55) | 34 (35.42) | 32 (24.62) | .010 |
| Indicated PTB <37 wk, N (%) | Yes | 12 (5.53) | 10 (10.42) | 12 (9.23) | .238 |
| PTB <35 wk, N (%) | Yes | 56 (25.81) | 25 (26.04) | 26 (20.00) | .420 |
| PTB <32 wk, N (%) | Yes | 34 (15.67) | 15 (15.63) | 15 (11.54) | .533 |
BMI, body mass index; PTB, preterm birth.