Adjusted* OR (aOR) for factors included in the regression model of caesarean delivery for nulliparous women 1994–2009
| Maternal/pregnancy factor | aOR (95% CI) of caesarean delivery |
|---|---|
| Age (increase in aOR per year) | 1.079 (1.078 to 1.08) |
| Preterm (<37 weeks) | 1.19 (1.16 to 1.22) |
| Multifetal pregnancy (twins, etc) | 3.15 (3 to 3.31) |
| Breech presentation | 30.95 (29.8 to 32.14) |
| Other malpresentation | 10.68 (9.87 to 11.56) |
| Induction or augmentation of labour | 1.09 (1.07 to 1.10) |
| Any diabetes | 1.54 (1.5 to 1.59) |
| Any hypertension | 1.97 (1.92 to 2.01) |
| Birthweight ≥4000 g | 2.35 (2.31 to 2.4) |
| Australian-born woman | 1.04 (1.02 to 1.05) |
| Private hospital versus public patient | 1.45 (1.42 to 1.47) |
| Private patient in public hospital versus public patient | 1.12 (1.1 to 1.15) |
*Simultaneous adjustment for all listed factors.