Table 1

Maternal characteristics used for determination of the propensity score for 160 281* WA unmatched public and private births

 Public patients in public hospitals (n=93802)Private patients in private hospitals (n=66479)p Value†Standardised difference (%)
Mean (±SD)Mean (±SD)
Maternal age (years)27.6 (5.7)31.8 (4.4)<0.000116.55
n (%)n (%)
Parity (2nd+ child)52119 (55.6)34405 (51.8)<0.0001−7.65
Single/divorced/widowed10031 (10.7)1726 (2.6)<0.0001−32.92
Indigenous8273 (8.8)144 (0.2)<0.0001−42.31
Smoking during pregnancy26642 (28.4)3292 (5.0)<0.0001−66.27
SE disadvantage47808 (51.0)10135 (15.3)<0.0001−82.04
Regional/remote residence39568 (42.2)5786 (8.7)<0.0001−83.27
Genital herpes1401 (1.5)1692 (2.6)<0.00017.54
Diabetes mellitus135 (0.1)245 (0.4)<0.00014.56
Asthma10090 (10.8)6611 (9.9)<0.0001−2.69
Previous caesarean9833 (10.5)12558 (18.9)<0.000123.93
Fertility treatment843 (0.9)2156 (3.2)<0.000116.49
  • *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.