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Table 1 Sociodemographic characteristics of singleton birth mothers by ART status, 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

  Non-ART ART P
(N = 381,345) (N = 12,105)
No. % No. %  
Maternal age (years)    
Mean ± SD 29.7 ± 5.7 34.0 ± 4.8 <0.01
Less than 24 76,182 20.0 267 2.2 <0.01
25–34 223,494 58.6 6,131 50.7  
35–44 81,216 21.3 5,535 45.7  
45 and over 439 0.1 172 1.4  
Maternal country of birth    
Australia 294,196 77.6 9,671 80.2 <0.01
Overseas 85,083 22.4 2,389 19.8  
BMI (kg/m 2 ) (a)    
Less than 18.5 4,749 4.3 163 3.9 <0.01
18.5–24.9 49,913 45.6 2,079 49.7  
25.0–29.9 30,819 28.2 1,086 26.0  
30.0–34.9 14,336 13.1 492 11.8  
35.0–39.9 6,199 5.7 223 5.3  
40.0 and over 3,470 3.2 140 3.4  
SEIFA Index of Disadvantage     
1 (Most disadvantaged) 78,473 20.7 1,498 12.4 <0.01
2 62,969 16.6 1,528 12.7  
3 83,153 22.0 2,620 21.7  
4 87,116 23.0 3,093 25.7  
5 (Least disadvantaged) 66,987 17.7 3,320 27.5  
Remoteness      
Major cities 244,632 64.2 8,778 72.6 <0.01
Inner regional 80,205 21.1 2,113 17.5  
Outer regional 44,867 11.8 1,009 8.3  
Remote 7,082 1.9 155 1.3  
Very remote 4,252 1.1 41 0.3  
Other(b) 307   9   
Smoking status during pregnancy (c)    
Yes 47,179 19.4 321 3.8 <0.01
No 196,661 80.7 8,181 96.2  
Parity      
Primiparous 154,519 40.5 7,549 62.4 <0.01
Multiparous 226,826 59.5 4,556 37.6  
Health insurance   
Public 256,511 67.6 3,274 27.1 <0.01
Private 122,987 32.4 8,812 72.9  
Other (d) 1,847   19   
  1. (a) Maternal pre-pregnancy body mass index (BMI) was available in only one jurisdiction between 2008 and 2009 (N = 119,257), accounting for 30.3% of the study population.
  2. (b) Includes 289 non-Australian residents and 27 not stated cases.
  3. (c) Smoking during pregnancy was indicated in two jurisdictions between 2007 and 2009, and one jurisdiction between 2008 and 2009 (N = 253,444), accounting for 64.42% of the study population.
  4. (d) Includes 1,124 not applicable and 742 not stated cases.