Table 2.

Predictors of Making a Quit Attempt and Predictors of Validated Abstinence in Pregnant Smokers

	Quit attempt (event rate = 148 of 175)		Validated abstinence (event rate = 20 of 136)
	Univariate OR (95% CI)	Multivariate OR (95% CI)	Univariate OR (95% CI)	Multivariate OR (95% CI)
MiQuit arm	1.49 (0.65–3.44)	1.88 (0.70–5.10)	1.55 (0.59–4.08)	2.36 (0.81–6.93)
Demographics
IMD score	0.99 (0.97–1.02)		1.01 (0.98–1.04)
Age group	1.02 (0.58–1.81)		0.49 (0.24–1.00)*	0.50 (0.23–1.07)
Has a partner who smokes	2.13 (0.93–4.89)*	2.57 (0.96–6.88)	0.50 (0.19–1.34)
Smoking/quitting behaviors
Nicotine dependence (higher = more dependent)	0.81 (0.47–1.40)		0.27 (0.12–0.62)***	0.25 (0.10–0.60)***
Any quit attempt prior to baseline	1.32 (0.37–4.79)		0.65 (0.14–3.05)
Duration of longest quit attempt prior to baseline	0.96 (0.73–1.28)		1.04 (0.75–1.45)
Smoked in a previous pregnancy	0.35 (0.14–0.87)**	0.47 (0.17–1.36)	0.54 (0.20–1.48)
Smoking/quitting beliefs
Intention to quit (higher = stronger intention)	2.66 (1.61–4.37)****	2.41 (1.19–4.87)**	0.64 (0.38–1.08)*	0.59 (0.32–1.10)
Nonsmoker identity	1.67 (1.08–2.59)**	1.30 (0.77–2.20)	1.17 (0.74–1.84)
Perceived social support	1.12 (0.82–1.55)		0.97 (0.66–1.42)
Harm to baby beliefs	1.38 (0.96–1.97)*	0.76 (0.44–1.30)	1.13 (0.71–1.79)
Cutting down beliefs	1.38 (0.96–1.98)*	1.16 (0.76–1.78)	0.92 (0.60–1.41)
Easier delivery beliefs	1.05 (0.72–1.54)		0.94 (0.61–1.46)
Determination to quit for remainder of pregnancy	2.07 (1.40–3.08)****	1.38 (0.71–2.65)	1.08 (0.64–1.85)
Self-efficacy score	1.79 (1.05–3.05)**	0.81 (0.39–1.70)	1.14 (0.62–2.12)
Interested in receiving risk information	0.67 (0.29–1.59)		1.68 (0.63–4.47)

CI = confidence interval; IMD = Index of Multiple Deprivation; OR = odds ratio.

*p < .1 (entry criterion for multivariate model); **p < .05; ***p < .01; ****p < .001.