Table 3

Antenatal and delivery characteristics of the 65 514* WA public and private births that were individually matched on the propensity score of maternal characteristics

Public patients in public hospitals (n=32757)Private patients in private hospitals (n=32757)Degrees of freedomp Value†
Antenatal risk factorsN (%)n (%)
Threatened miscarriage (<20 weeks)1507 (4.6)2192 (6.7)1<0.0001
Threatened preterm labour (<37 weeks)349 (1.1)388 (1.2)10.15
Urinary tract infection921 (2.8)869 (2.7)10.21
Pre-eclampsia1227 (3.8)1135 (3.5)10.05
Placenta praevia110 (0.3)220 (0.7)1<0.0001
Placental abruption79 (0.2)64 (0.2)10.21
Prelabour rupture of membranes1263 (3.9)541 (1.7)1<0.0001
Gestational diabetes1237 (3.8)1166 (3.6)10.14
Gestation (weeks)
 371650 (5.0)2571 (7.9)
 386659 (20.3)12 226 (31.2)
 397183 (21.9)8255 (25.2)
 4012 507 (38.2)9497 (29.0)
 414758 (14.5)2208 (6.7)4<0.0001
Onset of labour
 Spontaneous18 078 (55.2)12 549 (38.3)
 Induction8800 (26.9)11 967 (36.5)
 Caesarean5879 (18.0)8241 (25.2)2<0.0001
Mode of delivery
 Unassisted vaginal19 351 (59.1)14 822 (45.3)
 Assisted vaginal4017 (12.3)5973 (18.2)
 Caesarean with labour3510 (10.7)3721 (11.4)
 Caesarean without labour5879 (18.0)8,241 (25.2)3<0.0001
Epidural during labour‡9189 (34.2)14 708 (60.0)1<0.0001
Mean (±SD)Mean (±SD)
Infant weight (g)3498.8 (457.4)3443.9 (439.4)<0.0001
  • *Restricted to singleton, term births in non-tertiary hospitals, resulting in live-born infants without birth defects.

  • †t Test for means and χ2 test of independence for proportions.

  • ‡Only deliveries with labour.