| aOR (95% CI) | p value |
---|---|---|
Nulliparous | 8.70 (5.84–13.20) | < 0.001 |
Age (years) | ||
≤ 29 | 1.00 (−) |  |
30–34 | 1.26 (0.77–2.05) | 0.361 |
≥ 35 | 2.12 (1.25–3.65) | 0.006 |
BMI (kg/m2) < 25 | 0.75 (0.51–1.12) | 0.159 |
Birthweight (100 g) | 1.05 (1.00–1.09) | 0.035 |