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Table 5 Demographic, medical and obstetric characteristics and preterm births among non-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 = 381,345) Preterm births
No. % OR (95% CI) AOR (a)(95% CI)
Maternal age      
Less than 25 76,182 6,012 7.9 1.27 (1.23–1.31) 1.12 (1.08–1.16)
25-34 223,494 14,130 6.3 1 1
35-44 81,216 5,673 7.0 1.11 (1.08–1.15) 1.13 (1.09–1.17)
45 and over 439 44 10.0 1.65 (1.21–2.25) 1.49 (1.08–2.06)
Smoking status during pregnancy     
Smoked 47,179 4,569 9.7 1.64 (1.59–1.70) 1.55 (1.50–1.61)
Did not smoke 196,661 12,050 6.1 1 1
Maternal country of birth     
Overseas 85,083 5,464 6.4 0.93 (0.90–0.96) NS
Australia 294,196 20,211 6.9 1  
SEIFA Index of Disadvantage      
1 (Most disadvantaged) 78,473 5,919 7.5 1.28 (1.23–1.34) 1.14 (1.09–1.19)
2 62,969 4,565 7.3 1.23 (1.18–1.28) 1.11 (1.06–1.17)
3 83,153 5,543 6.7 1.12 (1.08–1.17) 1.05 (1.00–1.10)
4 87,116 5,516 6.3 1.06 (1.02–1.11) 1.02 (0.98–1.07)
5 (Least disadvantaged) 66,987 4,007 6.0 1 1
Parity      
Primiparous 154,519 11,397 7.4 1.17 (1.14–1.20) 1.13 (1.10–1.17)
Multiparous 226,826 14,474 6.4 1 1
Remoteness      
Major cities 244,632 15,951 6.5 1 1
Inner regional 80,205 5,732 7.2 1.10 (1.07–1.14) 1.00 (0.97–1.04)
Outer regional 44,867 3,216 7.2 1.11 (1.06–1.15) 1.01 (0.96–1.05)
Remote 7,082 528 7.5 1.15 (1.06–1.26) 1.04 (0.95–1.14)
Very remote 4,252 371 8.7 1.37 (1.23–1.53) 1.13 (1.01–1.27)
Health insurance     
Public 256,511 18,612 7.3 1 1
Private 122,987 7,207 5.9 0.80 (0.77–0.82) 0.89 (0.86–0.92)
Essential hypertension      
Yes 3,468 511 14.7 2.41 (2.19–2.65) 2.05 (1.86–2.27)
No 371,934 24,921 6.7 1 1
Diabetes mellitus      
Yes 2,447 606 24.8 4.62 (4.21–5.06) 4.13 (3.75–4.56)
No 372,954 24,826 6.7 1 1
Epilepsy      
Yes 2,007 219 10.9 1.10 (1.00–1.21) 1.49 (1.29–1.73)
No 373,395 25,213 6.8 1 1
Hypertensive disorders in pregnancy     
Yes 16,850 2,778 16.5 2.92 (2.80–3.05) 2.94 (2.81–3.08)
No 364,495 23,093 6.3 1 1
Gestational diabetes      
Yes 19,075 1,639 8.6 1.31 (1.24–1.38) 1.27 (1.20–1.34)
No 362,270 24,232 6.7 1 1
Antepartum haemorrhage     
Yes 10,699 3,311 31.0 6.92 (6.62–7.22) 7.11 (6.80–7.43)
No 370,632 22,557 6.1 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. NS: statistically not significant.