Table 2.

Logistic regression model predicting 7-day point prevalence of abstinence at week 8 (N=41)

		Unadjusted OR		Adjusted OR
Explanatory variables	N (%) Abstinent	(95% CI)	p-value	(95% CI)	p-value
Treatment
Progesterone	10 (45)	1.81 (0.50, 6.50)	0.37	1.77 (0.48, 6.52)	0.39
Placebo	6 (32)	1.00		1.00
Age
>25	9 (41)	1.19 (0.34, 4.19)	0.79	1.11 (0.31, 4.00)	0.87
≤25 years	7 (37)	1.00		1.00
Pre-quit smoking level
≤10 cigarettes/day	13 (38)	0.83 (0.16, 4.29)	0.82	0.93 (0.17, 5.03)	0.94
>10 cigarettes/day	3 (43)	1.00		1.00

OR= odds ratio, CI= confidence interval

Stratifying variables: age (18–25 years versus >25 years) and pre-quit smoking level (<10 versus >10 cigarettes per day)