Table 1.
Baseline maternal characteristics by parity
| Nulliparous n=18,245 | Multiparous n=21,625 | P* | |
|---|---|---|---|
| Age, yr | <0.001 | ||
| <20 | 3,280 (18.0) | 633 (2.9) | |
| 20–24.9 | 5,061 (27.7) | 4,190 (19.4) | |
| 25–29.9 | 4,743 (26.0) | 6,586 (30.5) | |
| 30–34.9 | 3,689 (20.2) | 6,423 (29.7) | |
| ≥35 | 1,472 (8.1) | 3,793 (17.5) | |
| Race and ethnicity | <0.001 | ||
| White | 9,270 (50.8) | 9,550 (44.2) | |
| Black | 3,446 (18.9) | 3,824 (17.7) | |
| Asian | 1,151 (6.3) | 820 (3.8) | |
| Hispanic | 3,381 (18.5) | 6,478 (30.0) | |
| Other | 997 (5.5) | 953 (4.4) | |
| Insurance† | <0.001 | ||
| Private | 10,303 (56.9) | 10,009 (46.6) | |
| Government assisted | 6,384 (35.2) | 8,541 (39.8) | |
| Uninsured | 1,431 (7.9) | 2,934 (13.7) | |
| Smoked cigarettes† | 1,504 (8.3) | 1,833 (8.5) | 0.40 |
| Drank alcohol† | 704 (3.9) | 573 (2.7) | <0.001 |
| BMI at delivery, kg/m2† | 29 (27–33) | 30 (27–34) | <0.001 |
| BMI at delivery, kg/m2† | <0.001 | ||
| <25 | 2,382 (13.2) | 2,454 (11.6) | |
| 25–29 | 7,562 (42.0) | 8,096 (38.4) | |
| 30–34 | 5,020 (27.9) | 6,497 (30.8) | |
| 35–39 | 1,953 (10.9) | 2,658 (12.6) | |
| ≥40 | 1,076 (6.0) | 1,406 (6.7) |
Data are n (%) or median (IQR) unless otherwise specified
BMI, body mass index
*
Based on χ2 or Wilcoxon
†
Missing in 766 (BMI); 22 (smoking); 43 (drinking); 268 (insurance)