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Table 2 Defining the interactions among high risk groups for smoking in pregnancy in NSW

From: Socio-demographic factors associated with smoking and smoking cessation among 426,344 pregnant women in New South Wales, Australia

  Percentage of smoking during pregnancy (SIP)
  Maternal age (years) Aboriginal status Weeks of gestation at 1st antenatal visit
  <20 years 20–34 35+ Aboriginal Non-Aboriginal 0–12 13–26 27+
Maternal age (years)         
<20 years - - - 60.5 40.5 43.0 41.6 44.7
20–34 - - - 56.7 15.9 14.3 18.3 31.4
35+ - - - 60.2 10.7 9.4 12.7 24.6
Aboriginal status         
Aboriginal 60.5 56.7 60.2 - - 51.3 58.2 72.5
Non-Aboriginal 40.5 15.9 10.7 - - 13.6 17.6 28.7
Socio-economic status (SES)         
Lowest SES 42.8 21.5 17.4 59.8 20.7 20.1 22.1 34.4
Moderate SES 43.7 16.6 11.5 55.1 16.0 14.5 18.8 32.1
Highest SES 36.3 6.9 4.8 36.5 6.5 5.0 9.1 16.3
Country of birth         
English speaking background 45.7 19.8 13.5 - - 16.1 23.9 45.0
Non-English speaking background 10.3 4.9 4.8 - - 3.8 5.2 9.4
Weeks of gestation at 1st antenatal visit         
0–12 weeks 43.0 14.3 9.4 51.3 13.6 - - -
13–26 weeks 41.6 18.3 12.7 58.2 17.6 - - -
27 weeks + 44.7 31.4 24.6 72.5 28.7 - - -