Increased risk | | |
Maternal age 25–29 years | 1.46 | 1.09 to 1.96 |
Maternal age 30–34 years | 1.71 | 1.26 to 2.32 |
Maternal age ≥ 35 years | 1.72 | 1.22 to 2.44 |
Parity 0 | 2.19 | 1.83 to 2.62 |
Parity 1 | 1.29 | 1.07 to 1.56 |
Breech presentation and caesarean delivery | 10.0 | 8.58 to 11.7 |
Emergency caesarean delivery | 13.2 | 10.7 to 16.3 |
Elective caesarean delivery | 7.56 | 6.27 to 9.12 |
Breech presentation and delivery | 17.2 | 12.8 to 23.0 |
Female sex | 3.94 | 3.41 to 4.56 |
Living in a metropolitan area | 1.45 | 1.23 to 1.69 |
Living in an outer metropolitan area | 1.86 | 1.41 to 2.46 |
Presence of oligohydramnios | 3.97 | 1.69 to 9.35 |
Birth weight 4000–4499 g | 1.55 | 1.26 to 1.91 |
Birth weight ≥ 4500 g | 2.67 | 1.81 to 3.94 |
Gestation 41 weeks | 1.26 | 1.05 to 1.51 |
Gestation ≥ 42 weeks | 1.48 | 1.02 to 2.13 |
Decreased risk | | |
Birth weight < 2000 g | 0.30 | 0.12 to 0.77 |
Birth weight 2000–2499 g | 0.52 | 0.31 to 0.88 |
Gestation < 37 weeks | 0.42 | 0.25 to 0.69 |
Gestation 37 weeks | 0.59 | 0.40 to 0.86 |
Gestation 38 weeks | 0.80 | 0.66 to 0.98 |