Table 2

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

 Public patients in public hospitals (n=32757)Private patients in private hospitals (n=32757)p Value†Standardised difference (%)
Mean (±SD)Mean (±SD)
Maternal age (years)30.3 (4.7)30.4 (4.7)0.00092.60
n (%)n (%)
Parity (2nd+ child)16642 (50.8)16713 (51.0)0.580.44
Single/divorced/widowed1255 (3.8)1247 (3.8)0.87−0.10
Indigenous101 (0.3)112 (0.3)0.450.53
Smoking during pregnancy2937 (9.0)2925 (8.9)0.87−0.14
SE disadvantage8936 (27.3)8762 (26.8)0.13−1.19
Regional/remote residence5403 (16.5)5369 (16.4)0.72−0.27
Genital herpes597 (1.8)646 (2.0)0.161.10
Diabetes mellitus49 (0.2)44 (0.1)0.60−0.53
Asthma2962 (9.0)3121 (9.5)0.031.69
Previous caesarean4525 (13.8)4575 (14.0)0.570.46
Fertility treatment533 (1.6)586 (1.8)0.111.23
  • *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.

  • SE, socioeconomic.