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Table 1 Demographics, pre-existing conditions and pregnancy complications of mothers of ART and non-ART twin sets, Australia, 2007–2011

From: Neonatal outcomes among twins following assisted reproductive technology: an Australian population-based retrospective cohort study

  Non-ART mothers (n = 7541) ART mothers (n = 2290) P value (chi-squared test)
No. % No. %
Maternal age, years
Mean ± SD 30.6 ± 5.4   33.9 ± 4.6   < 0.01*
  < 30 3151 41.8 380 16.6 <  0.01
 30–34 2451 32.5 874 38.2
 35–39 1678 22.3 795 34.7
 40–44 253 3.4 184 8.0
  ≥ 45 8 0.1 57 2.5
Pre-pregnancy BMI, kg/m2
  < 20 124 1.6 36 1.6 0.44
 20–24.9 516 6.8 213 9.3
 25–29.9 424 5.6 157 6.9
 30 + 334 4.5 115 5.0
 Not stated 6134 81.3 1769 77.2  
Parity
 Primiparous 2773 36.8 1460 63.8 <  0.01
 Multiparous 4768 63.2 830 36.2
Smoking during pregnancy
 Smoked 1023 13.6 47 2.1 <  0.01
 Did not smoke 4533 60.1 1709 74.6
 Not stated 1985 26.3 534 23.3  
Indigenous status of mothers
 Non-Indigenous 7239 96.0 2280 99.6 < 0.01
 Indigenous 295 3.9 9 0.4
 Not stated 7 0.1 1 0.0  
Admitted patient elected accommodation status
 Public 5014 66.5 612 26.7 < 0.01
 Private 2519 33.4 1676 73.2
 Not stated 8 0.1 2 0.1  
Pre-existing hypertension
 Yes 82 1.1 34 1.5 0.13
 No 7394 98.1 2242 97.9
 Not stated 65 0.9 14 0.6  
Pre-existing diabetes
 Yes 42 0.6 13 0.6 0.96
 No 7431 98.5 2262 98.8
 Not stated 68 0.9 15 0.7  
Antepartum haemorrhage
 Yes 340 4.5 130 5.7 0.02
 No 7201 95.5 2160 94.3
Pregnancy-induced hypertension
 Yes 634 8.4 280 12.2 < 0.01
 No 6907 91.6 2010 87.8
Gestational diabetes
 Yes 567 7.5 222 9.7 < 0.01
 No 6974 92.5 2068 90.3
  1. *independent samples t-test