Maternal characteristics: distribution in cases and controls and bivariate analysis
| Women with severe PPH (N=1483), n (%)* | Controls (N=1758), n (%)* | p Value† | |
| Maternal age (years) | |||
| Mean (SD) | 29.4 (5.0) | 30.2 (5.0) | 10−3 |
| Median (25th, 75th pc) | 29.3 (26.0, 32.4) | 30.2 (26.6, 33.8) | |
| <20 | 34 (2) | 20 (1) | |
| 20 to <30 | 789 (53) | 831 (47) | |
| 30 to <40 | 626 (42) | 866 (49) | |
| ≥40 | 34 (2) | 41 (2) | |
| BMI (kg/m2) | |||
| Mean (SD) | 22.5 (4.1) | 22.4 (3.96) | 0.3 |
| Median (25th, 75th pc) | 21.5 (19.7, 24.1) | 21.5 (19.7, 24.2) | |
| <18 | 93 (7) | 81 (5) | |
| 18 to <25 | 960 (73) | 1104 (74) | |
| 25 to <30 | 187 (14) | 223 (15) | |
| ≥30 | 76 (6) | 79 (5) | |
| MD | 167 (11)‡ | 271 (15)‡ | |
| Primiparous | 1044 (70) | 762 (43) | 10−3 |
| Previous PPH | 53 (4) | 34 (2) | 10−2 |
| Previous uterine curettage | 153 (10) | 179 (10) | 0.9 |