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Table 3 Socio-demographic determinants of smoking cessation and heavy smoking during pregnancy: percentage of quit, % of heavy smokers and adjusted odds ratios (AOR) from multiple logistic regression analysis

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

Socio-demographic characteristics Total number of smokers % of smokers quit smoking (n = 2,920) ΨAdjusted odds ratio (95% CI) % of heavy smokers ΨAdjusted odds ratio (95% CI)
Year of delivery#      
1999–2003 69500 4.0   49.6  
1999 16302 4.5 1.00 52.2 1.00
2000 15000 4.1 0.92 (0.83–1.04) 49.7 0.90 (0.86–0.94)*
2001 14422 4.0 0.92 (0.82–1.03) 49.6 0.89 (0.85–0.93)*
2002 13820 4.0 0.94 (0.83–1.05) 48.9 0.85 (0.81–0.89)*
2003 12875 3.3 0.77 (0.68–0.87)* 46.8 0.78 (0.76–0.82)*
Maternal age (years)#      
Under 20 years 8063 3.9 0.84 (0.71–0.99)* 45.4 1.00
20–34 55625 4.1 1.11 (0.98–1.26) 49.6 1.01 (0.95–1.06)
35+ 8705 3.6 1.00 53.0 1.18 (1.10–1.27)*
Aboriginal status#      
Non Aboriginal 66287 4.3 1.86 (1.51–2.30)* 48.7 1.00
Aboriginal 6112 1.6 1.00 58.6 1.24 (1.17–1.31)*
Parity#      
Primiparous 25407 6.8 2.55 (2.34–2.77)* 40.2 1.00
Multiparous 47007 2.6 1.00 54.4 1.68 (1.62–1.73)*
Country of birth#      
Australian born 63519 4.0 1.00 50.7 1.00
NZ and Oceania 3374 3.4 0.94 (0.77–1.14) 41.3 0.61 (0.57–0.66)*
UK & Ireland 1488 4.7 0.90 (0.70–1.16) 47.6 0.94 (0.84–1.04)
Other Europe 1129 4.1 0.83 (0.61–1.12) 40.4 0.68 (0.60–0.78)*
Middle East 1406 2.8 0.87 (0.63–1.21) 41.3 0.56 (0.51–0.64)*
Asia 822 10.9 2.71 (2.15–3.43)* 28.1 0.37 (0.31 – 0.44)*
America/Africa 380 7.4 1.38 (0.91–2.1) 35 0.56 (0.44–0.69)*
Others 258 5.6 1.00(0.57–1.76) 45.9 0.89 (0.69–1.17)
SES#      
Lowest SES 37289 3.1 1.00 52.7 1.84 (1.72–1.96)*
Moderate SES 28485 3.8 1.11 (1.02–1.21)* 48.0 1.58 (1.48–1.68)*
Highest SES 5797 10.2 2.79 (2.51–3.10)* 35.8 1.00
Booking in#: Booked 68710 4.2 1.83 (1.33–2.53)* 48.9 1.00
Unbooked 3710 1.3 1.00 62.0 1.20 (1.10–1.31)*
Weeks at 1st antenatal visit#      
0–12 weeks 35263 5.0 2.33 (1.91–2.85)* 46.7 1.00
13–26 weeks 29084 3.6 1.75 (1.42–2.14)* 50.1 1.17 (1.13–1.21)*
27 weeks + 6453 1.7 1.00 58.3 1.55 (1.47–1.66)*
Any obstetric condition#: No 67272 3.9 1.00 48.9 1.00
Yes 5148 5.4 1.19 (1.04–1.35)* 62.0 1.20 (1.10–1.31)*
  1. #Statistically significant (p < 0.05) in bivariate analyses; * ORs significant at p < 0.05 level; The fitted multiple logistic regression model is significant at p < 0.001; The model predicted overall 95.9% correctly classified (considering cut point 0.50). For all variables not stated and missing cases excluded from the analyses.