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Table 6 Demographic, medical and obstetric characteristics and preterm births among ART singleton birth mothers, Australia, 2007–2009

From: Risk factors associated with preterm birth among singletons following assisted reproductive technology in Australia 2007–2009–a population-based retrospective study

Characteristics All singleton births (N = 12,105) Preterm births
No. % OR (95% CI) AOR (a)(95% CI)
Maternal age      
Less than 25 267 23 8.6 0.86 (0.56–1.33) NS
25-34 6,131 604 9.9 1  
35-44 5,535 566 10.2 1.04 (0.92–1.18)  
45 and over 172 26 15.1 1.63 (1.06–2.49)  
Smoking status during pregnancy     
Smoked 321 35 10.9 1.12 (0.79–1.61) NS
Did not smoke 8,181 803 9.8 1  
Maternal country of birth     
Australia 9,671 941 9.7 1 NS
Overseas 2,389 268 11.2 1.17 (1.02–1.35)  
SEIFA Index of Disadvantage     
1 (Most disadvantaged) 1,498 140 9.4 0.95 (0.77–1.17) NS
2 1,528 169 11.1 1.15 (0.94–1.40)  
3 2,620 282 10.8 1.12 (0.94–1.32)  
4 3,093 297 9.6 0.98 (0.83–1.16)  
5 (Least disadvantaged) 3,320 324 9.8 1  
Parity      
Primiparous 4,556 414 9.1 1.19 (1.05–1.35) NS
Multiparous 7,549 805 10.7 1  
Remoteness      
Major cities 8,778 910 10.4 1 (b)
Inner regional 2,113 191 9.0 0.86 (0.73–1.01)  
Outer regional 1,009 98 9.7 0.93 (0.75–1.16)  
Remote 155 14 9.0 0.86 (0.49–1.49)  
Very remote 41 2 4.9 0.44 (0.11–1.84)  
Health insurance     
Public 3,274 367 11.2 1 NS
Private 8,812 847 9.6 0.84 (0.74–0.96)  
Essential hypertension     
Yes 137 27 19.7 2.21 (1.45–3.39) 2.16 (1.39–3.36)
No 11,717 1,169 10.0 1 1
Diabetes mellitus      
Yes 78 21 26.9 3.32 (2.01–5.50) 2.74 (1.61–4.67)
No 11,776 1,175 10.0 1 1
Epilepsy      
Yes 54 9 16.7 1.79 (0.87–3.67) (b)
No 11,800 1,187 10.1 1  
Hypertensive disorders in pregnancy    
Yes 742 175 23.6 3.05 (2.55–3.66) 3.21 (2.67–3.87)
No 11,363 1,044 9.2 1 1
Gestational diabetes     
Yes 904 125 13.8 1.48 (1.22–1.81) 1.43 (1.17–1.76)
No 11,201 1,094 9.8 1 1
Antepartum haemorrhage     
Yes 600 189 31.5 4.68 (3.89–5.62) 4.83 (4.01–5.82)
No 11,505 1,030 9.0 1 1
  1. (a) Stepwise multiple logistic regression model adjusted for maternal age, country of birth, smoking status during pregnancy, SEIFA, parity, health insurance type, remoteness, essential hypertension, diabetes mellitus, epilepsy, hypertensive disorders in pregnancy, gestational diabetes and antepartum haemorrhage.
  2. (b) Item removed from the model due to less than 20 cases in any category.
  3. NS: statistically not significant.