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Table 2 Birth outcomes of ART and non-ART twins, Australia, 2007–2011

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

  Non-ART twins (N = 15,082) ART twins (N = 4580) P-value (chi-squared test)
No. % No. %
Delivery method
 Vaginal 4587 30.4 758 16.6 < 0.01
 Labour caesarean section 3104 20.6 1011 22.1
 No labour caesarean section 7038 46.7 2764 60.3
 Not stated 353 2.3 47 1.0  
Birth status
 Live birth 14,734 97.7 4516 98.6 < 0.01
 Stillbirth (fetal death) 348 2.3 64 1.4
Preterm birth
 Yes 8585 56.9 2818 61.5  
 - Spontaneous 4050 26.8 1104 24.1 < 0.01
 - Induced or no labor CS 4535 30.1 1714 37.4
 No 6497 43.1 1762 38.5