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Table 1 Demographics of very preterm singletons by mode of conceptions

From: Morbidity and mortality among very preterm singletons following fertility treatment in Australia and New Zealand, a population cohort study

  Spontaneous HO ART AI P valuea
  (20,530) (216) (953) (54)  
  # % # % # % # %  
Maternal age (years) Mean ± SD 28.87 ±6.3 30.36 ±4.9 34.64 ±4.7 33.33 ±4.7 <0.05b
Gestational age (weeks) Mean ± SD 28.44 ±2.5 28.12 2.4± 28.25 2.3± 28.19 2.3± 0.01
Aboriginal status          
 Yes 1274 6.2 4 1.9 10 1.0 0 0.0 <0.05
 no 17079 83.2 186 86.1 830 87.1 52 96.3  
 Not stated 2177 10.6 26 12 113 11.9 2 3.7  
Previous preterm birth          
 Yes 3928 19.1 24 11.1 78 8.2 7 13.0 <0.05
 No 16506 80.4 192 88.9 874 91.7 47 87.0  
 Not stated 96 0.5 0 0.0 1 0.1 0 0.0  
Previous perinatal death          
 Yes 1239 6.0 11 5.1 38 4.0 5 9.3 <0.05
 No 19218 93.6 205 94.9 915 96.0 49 90.7  
 Not stated 73 0.4 0 0.0 0 0.0 0 0.0  
Premature rupture of membranes         
 Yes 5243 25.5 44 20.4 246 25.8 10 18.5 0.301
 No 15256 74.3 171 79.2 704 73.9 44 81.5  
 Not stated 31 0.2 1 0.5 3 0.3 0 0.0  
Pregnancy inducted hypertension         
 Yes 3619 17.6 58 26.9 199 20.9 20 37.0 <0.05
 No 16895 82.3 157 72.7 752 78.9 34 63.0  
 Not stated 16 0.1 1 0.5 2 0.2 0 0.0  
Antepartum haemorrhage          
 Yes 5028 24.5 47 21.8 262 27.5 13 24.1 0.063
 No 15488 75.4 168 77.8 689 72.3 41 75.9  
 Not stated 14 0.1 1 0.5 2 0.2 0 0.0  
Antenatal steroid          
 None 2724 13.3 17 7.9 76 8 3.0 5.6 <0.05
 Incomplete 5514 26.9 56 25.9 234 24.6 13 24.1  
 Complete 9377 45.7 111 51.4 468 49.1 33 61.1  
 More than 7 days 2548 12.4 31 14.4 156 16.4 5 9.3  
 Not stated 367 1.8 1 0.5 19 2.0 0 0.0  
Gender of baby          
 Male 11279 54.9 122 56.5 517 54.2 33 61.1 0.98
 Female 9233 45.0 94 43.5 436 45.8 21 38.9  
 Ambiguous 2 0.0 0 0.0 0 0.0 0 0.0  
 Not stated 16 0.1 0 0.0 0 0.0 0 0.0  
  1. a chi square test.
  2. b Analysis of variance