Predictors in our data set | ||
---|---|---|
Prevalence n (%) | Crude odds ratio (95 % CI) | |
Maternal age a | ||
<20 | 1,624 (2.2) | 1.0 (0.8, 1.2) |
20–29 | 32,140 (42.7) | REF |
30–40 | 38,444 (51.1) | 1.0 (0.9, 1.0) |
≥40 | 3,017 (4.0) | 1.4 (1.3, 1.6) |
Prepregnancy body mass index a | ||
25–29 | 46,979 (62.5) | REF |
30–34 | 17,692 (23.5) | 1.6 (1.5, 1.7) |
35–39 | 6,968 (9.3) | 2.1 (1.9, 2.3) |
≥40 | 3,586 (4.8) | 1.8 (2.5, 3.1) |
Maternal height <60 in. | 4,280 (5.7) | 0.9 (0.8, 1.0) |
Nulliparity | 32,571 (43.3) | 2.5 (2.4, 2.6) |
Pre-existing diabetes | 769 (1.0) | 2.9 (2.4, 3.5) |
Smoking | 8,411 (11.2) | 0.9 (0.8, 1.0) |
History of stillbirth | 713 (0.9) | 0.8 (0.6, 1.1) |
History neonatal death | 281 (0.4) | 1.0 (0.6, 1.5) |
History of spontaneous abortion | 18,046 (24.0) | 1.0 (0.9, 1.0) |