Demographic details and outcomes for mothers and babies for BBA at ≥37 weeks gestation
| BBA (n=4320) | Non-BBA (n=1 092 708) | P values | |
| Maternal age (mean) | 30.1 (5.66) | 30.4 (5.57) | 0.002 |
| Primiparous | 11.4% | 42.0% | <0.001 |
| Smoker | 27.5% | 13.4% | <0.001 |
| Australian born | 73.3% | 70.4% | <0.001 |
| Hypertension | 1.7% | 6.2% | <0.001 |
| Diabetes | 3.1% | 5.1% | <0.001 |
| Private patient | 5.9% | 24.3% | <0.001 |
| Birth weight (g) | 3327.5 (482.80) | 3460.4 (483.61) | <0.001 |
| Sex | |||
| Male | 45.7% | 51.2% | <0.001 |
| Female | 54.3% | 48.8% | |
| Admitted to SCN/NICU | 14.3% | 11.4% | <0.001 |
| SPT | 0.9% | 2.0% | <0.001 |
| PMR (per 1000 births) | 6.7 | 2.2 | <0.001 |
| PPH requiring transfusion (2006 onwards) | 0.7% | 0.7% | 0.827 |
BBA, born before arrival; NICU, neonatal intensive care unit; PMR, perinatal mortality rate; PPH, postpartum haemorrhage; SCN, special care nursery; SPT, severe perineal trauma.