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Table 1 Socio-demographic determinants of smoking during pregnancy: percentage of smoking 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 women (%)

% of smokers (n = 72,428)

ΨAdjusted odds ratio (95% CI)

Year of delivery#

   

1999–2003

426344 (100.0)

17.0

 

1999

85655 (20.2)

19.0

1.00

2000

86439 (20.3)

17.4

0.91 (0.88–0.93)*

2001

84362 (19.8)

17.1

0.87 (0.85–0.89)*

2002

84573 (19.8)

16.4

0.83 (0.81–0.85)*

2003

85015 (19.9)

15.1

0.77 (0.75–0.79)*

Maternal age (years)#

   

Under 20 years

18778 (4.4)

42.9

3.73 (3.58–3.89)*

20–34

329834(77.4)

16.9

1.31 (1.27–1.34)*

35+

77553(18.2)

11.2

1.00

Aboriginal status#

   

Non Aboriginal

415583(97.5)

16.0

1.00

Aboriginal

10579 (2.5)

57.8

3.43 (3.29–3.58)*

Parity#

   

Primiparous

177304 (41.6)

14.3

1.00

Multiparous

248991 (58.4)

18.9

1.49 (1.46–1.51)*

Country of birth#

   

Australian born

309580 (72.7)

20.5

1.00

NZ and Oceania

17809(4.2)

18.9

0.75 (0.72–0.78)*

UK & Ireland

12866 (3.0)

11.6

0.77 (0.73–0.82)*

Other Europe

11195 (2.6)

10.1

0.51 (0.47–0.54)*

Middle East

16864 (4.0)

8.3

0.25 (0.24–0.27)*

Asia

46721 (11.0)

1.8

0.066 (0.06–0.07)*

America/Africa

7313 (1.7)

5.2

0.24 (0.22–0.26)*

Others

3680 (0.9)

7.0

0.44 (0.39–0.50)*

Socio-economic status (SES)#

   

Lowest SES

166987 (39.5)

22.3

3.33 (3.23–3.43)*

Moderate SES

168661 (39.9)

16.9

2.40 (2.32–2.47)*

Highest SES

87404 (20.7)

6.6

1.00

Booking in#

   

Booked

416223 (97.6)

16.5

1.00

Unbooked

10120(2.4)

36.7

1.52 (1.44–1.61)*

Weeks at 1st antenatal visit#

   

0–12 weeks

245729 (58.2)

14.4

1.00

13–26 weeks

156396 (37.0)

18.6

1.45 (1.42–1.47)*

27 weeks +

20314(4.8)

31.8

2.68 (2.58–2.77)*

  1. #Statistically significant (p < 0.05) in bivariate analyses; * ORs significant at p < 0.05 level; ΨThe fitted multiple logistic regression model is significant at p < 0.0001 (Model Chi square = 44067.74, df = 20), The model predicted overall 83.7% correctly classified (considering cut point 0.50). Dependent variable: Current smoking status (smoked yes = 1, no smoking = 0), Explanatory variables :Year of delivery, maternal age, Aboriginal status, parity, country of birth, SES, booking in and weeks of gestation at first antenatal care. For all variables not stated and missing cases excluded from the analyses.