| Complications | BMI <30 | BMI 30–39.9 | BMI ⩾40 |
| (n = 5018) | (n = 1159) | (n = 149) | |
| Gestational diabetes | 1.22% | 2.42% | 5.37% |
| Caesarean section | 21.10% | 32.78% | 46.30% |
| Postpartum haemorrhage | 17.95% | 28.73% | 32.21% |
| Macrosomia | 0.52% | 1.46% | 4.69% |
| Shoulder dystocia | 1.05% | 1.63% | 2.00% |
| Stillbirth | 0.43% | 1.20% | 0.67% |