Table 1.
Characteristics (median (interquartile range) or n (%)) of 1,011 women, by history of obstetric exposures
| At least one cesarean in active labor (n= 368) | At least one vaginal birth (n= 451) | P value | ||||
|---|---|---|---|---|---|---|
| (0) | (1) | (2) | (3) | (4) | ||
| All births cesarean prior to active labor (n= 192) | Never reached complete cervical dilation (n= 228) | At least one cesarean after complete cervical dilation (n= 140) | No operative vaginal births (n= 325) | At least one operative vaginal birth (n= 126) | ||
| Age at enrollment, years | 40.0 (36.1, 43.6) | 38.3 (34.6, 42.1) | 40.3 (36.9, 43.6) | 39.3 (35.7, 42.8) | 40.8 (36.6, 43.4) | 0.001 |
| Years from 1st delivery to enrollment | 7.0 (6.2, 8.6) | 7.4 (6.3, 8.8) | 7.4 (6.2, 9.0) | 7.5 (6.3, 9.2) | 7.5 (6.6, 9.2) | 0.040 |
| Primary Race | ||||||
| Caucasian | 154 (80%) | 164 (72%) | 129 (92%) | 275 (85%) | 108 (86%) | [lt]0.001 |
| Black | 32 (17%) | 48 (21%) | 5 (4%) | 40 (12%) | 12 (10%) | |
| Other | 6 (3%) | 16 (7%) | 6 (4%) | 10 (3%) | 6 (5%) | |
| Maternal age[mt]35 yrs at 1st delivery | 64 (33%) | 52 (23%) | 45 (32%) | 86 (26%) | 36 (29%) | 0.116 |
| Multiparous at enrollment | 131 (68%) | 157 (69%) | 99 (71%) | 249 (77%) | 90 (71%) | 0.188 |
| BMI†≥ 30kg/m2 at enrollment | 65 (34%) | 85 (37%) | 35 (25%) | 59 (18%) | 15 (12%) | [lt]0.001 |
| Smoking ever¥ | 78 (41%) | 68 (30%) | 46 (33%) | 94 (29%) | 38 (30%) | 0.075 |
†
BMI = Body mass index = weight (kg)/ (height(m))2
¥
Smoking ever = smoked at least 100 cigarettes in entire life