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Table 5 Caesarean section, preterm birth and low birthweight by parity, ART and plurality

From: Very advanced maternal age and morbidity in Victoria, Australia: a population based study

  30–34 years 45+ years OR 95% CI p-value
  n % n %    
CS        
  primip 6,729 35.0 62 81.6 8.24 (4.5, 15.4) <0.0001
  Multi 8,954 30.2 58 41.1 1.62 (1.1, 2.3) 0.0047
  ART 673 50.0 46 85.2 5.75 (2.5, 13.3) <0.0001
  No ART 15,010 31.6 74 45.4 1.80 (1.3, 2.5) 0.0001
  Singleton 14,991 31.3 107 52.5 2.42 (1.8, 3.2) <0.0001
  Multiple 692 70.4 13 100.0 undefined   0.0139*
Preterm birth        
  Primip 1,766 9.0 20 23.5 3.13 (1.8, 5.3) <0.0001
  Multi 1,930 6.4 18 12.4 2.08 (1.2, 3.5) 0.0032
  ART 423 26.3 16 25.0 0.93 (0.5, 1.7) 0.8114
  No ART 3,273 6.8 22 13.2 2.10 (1.3, 3.4) 0.0009
  Singleton 2,594 5.4 22 10.8 2.11 (1.3, 3.4) 0.0007
  Multiple 1,102 55.7 16 61.5 1.27 (0.5, 3.0) 0.5486
Low Birthweight        
  Primip 1,529 7.8 21 24.7 3.90 (2.3, 6.6) <0.0001
  Multi 1,513 5.0 8 5.5 1.11 (0.5, 2.3) 0.7808
  ART 357 22.2 15 23.4 1.07 (0.6, 2.0) 0.8218
  No ART 2,685 5.6 14 8.4 1.56 (0.9, 2.8) 0.1070
  Singleton 2,038 4.3 12 5.9 1.41 (0.8, 2.6) 0.2501
  Multiple 1,004 50.8 17 65.4 1.83 (0.8, 4.5) 0.1397
  1. *Fisher’s exact test.