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
| 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)* |
#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.