Table 4.

Univariate and Multivariable Analyses Comparing 7-Day Point Prevalence of Abstinence From Smoking Between Study and Control Groups

Follow-up Evaluation*	Unadjusted			Adjusted
	OR (95% CI)	p Value	N	OR (95% CI)	p Value	N
Using intent-to-treat design
1 mo	1.13 (0.74–1.72)	0.58	95/990	1.16 (0.76–1.77)	0.50	95/986
3 mo	1.06 (0.73–1.53)	0.76	131/990	1.13 (0.78–1.64)	0.53	129/986
6 mo	0.99 (0.70–1.40)	0.95	151/990	0.99 (0.68–1.42)	0.95	150/986
12 mo	0.93 (0.65–1.32)	0.67	143/990	0.90 (0.62–1.31)	0.59	141/986
Not using intent-to-treat design
1 mo	1.09 (0.71–1.69)	0.69	95/722	1.13 (0.73–1.74)	0.59	95/719
3 mo	1.03 (0.71–1.51)	0.87	131/707	1.10 (0.75–1.63)	0.61	129/703
6 mo	0.96 (0.67–1.39)	0.83	151/611	1.00 (0.68–1.46)	0.99	150/608
12 mo	0.90 (0.62–1.33)	0.71	143/521	0.93 (0.63–1.38)	0.71	141/518

Values are given as No. of subjects abstaining from smoking for at least 7 days/total population in each study arm, unless otherwise indicated. The total population in each study arm varies between adjusted and unadjusted analysis because of missing covariate values. OR = odds ratio.

*For 1- and 3-month follow-up, data were adjusted in multivariable logistic regression analysis for baseline number of cigarettes smoked daily, baseline educational status, and baseline confidence level in quitting. For 6- and 12-month follow-up, data were additionally adjusted for pharmacologic aids used.