Table 1.
Patient cohort characteristics.
| Variable | Value | |
|
|
Overall (N=30,867) | PPHa (n=2179) |
| Age (years), mean (range, SD) | 32.7 (18-55, 5.3) | 34.3 (18-54, 5.4) |
| Gestation (days) | 274.6 | 272.2 |
| BMI (kg/m2) | 28.5 | 30.0 |
| Vaginal delivery, n (%) | 22,314 (72.3) | 399 (18.3) |
| Cesarean delivery, n (%) | 8534 (27.6) | 1776 (81.5) |
| Unknown mode of delivery, n (%) | 19 (0.1) | 4 (0.2) |
| Operative vaginal delivery, n (%) | 1502 (4.9) | 51 (2.3) |
| Vaginal birth after cesarean, n (%) | 1019 (3.3) | 24 (1.1) |
| Multiple gestation, n (%) | 143 (0.5) | 35 (1.6) |
| Current tobacco use, n (%) | 142 (0.5) | 10 (0.5) |
| Maternal diabetes, n (%) | 1544 (5.0) | 172 (7.9) |
| Maternal pre-eclampsia or eclampsia, n (%) | 508 (1.6) | 65 (3.0) |
| IUFDb, n (%) | 111 (0.4) | 11 (0.5) |
| Labor induced, n (%) | 16,962 (55.0) | 927 (42.5) |
| Primiparous, n (%) | 16,858 (54.6) | 1404 (64.4) |
| Primary cesarean delivery, n (%) | 7070 (82.8) | 1564 (88.1) |
| Cesarean performed prior to labor or rupture, n (%) | 4801 (56.3) | 880 (49.5) |
aPPH: postpartum hemorrhage.
bIUFD: intrauterine fetal demise.