Table 2.

Relationship Between Treatment Group and 7-day Point-Prevalence Abstinence Over Time

Model 1	Odds Ratio	95% CI
Treatment Group
ST*	-	-
CDT	0.842	0.547 – 1.297

Model 2	Odds Ratio	95% CI
Treatment Group
ST*	-	-
CDT	0.891	0.571 – 1.391
Age, years	1.001	0.978 – 1.025
Race/Ethnicity
White*	-	-
Other	0.841	0.489 – 1.446
Gender
Male*	-	-
Female	0.872	0.551 – 1.380
Marital Status
Married	1.082	0.674 – 1.737
Not Married*	-	-
Education
≤ High School/GED*	-	-
Tech/Voc/Some college	1.073	0.633 – 1.818
≥ College degree	2.069	0.816   5.247
Cigarettes per day	0.970	0.946 – 0.994

Note:

^*Reference group for calculating/testing the Odds Ratio. Both Model 1 and Model 2 were additionally adjusted for study site and time. ST = Standard Treatment. CDT = Computer-Delivered Treatment. With a planned sample size of 150 per group, the study had 80% power to detect an abstinence difference of 25% versus 40% between the ST and CDT groups at 12 months using a two-sided chi-squared test at a significance level of 0.05 (with intraclass correlation =1). This represented a worst case scenario, as the present analysis was longitudinal in nature and incorporated 4 follow-up time points (Week 1, and Months 1, 6, and 12 post-target quit date).