Table 3.

Association between website usage and quit behavior over time using generalized estimating equations (GEE).

Regression models		Quit attempts		7-Day abstinence		30-Day abstinence
		OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P
Model 1 a
	Visits to the websiteb	1.09 (0.94-1.28)	.26	2.04 (1.75-2.39)	<.001	1.73 (1.47-2.05)	<.001
Model 2 a
	Visits to the websiteb	1.10 (0.88-1.38)	.39	1.55 (1.26-1.91)	<.001	1.36 (1.08-1.70)	.008
Use of Community feature
	1 vs 0 times	0.79 (0.53-1.17)	.24	1.74 (1.13-2.67)	.01	1.37 (0.81-2.30)	.24
	≥2 vs 0 times	1.06 (0.62-1.83)	.82	2.22 (1.34-3.69)	.002	2.42 (1.35-4.34)	.003
Use of Cigarette Tracker feature
	1 vs 0 times	0.62 (0.40-0.96)	.03	1.27 (0.48-1.21)	.33	0.97 (0.56-1.70)	.30
	≥2 vs 0 times	0.42 (0.22-0.80)	.01	0.82 (0.28-1.01)	.55	0.81 (0.38-1.72)	.13
Use of Beat Triggers exercise feature
	1 vs 0 times	1.36 (0.87 2.14)	.18	1.16 (0.72-1.88)	.54	0.87 (0.50-1.52)	.63
	≥2 vs 0 times	1.20 (0.60-2.37)	.61	1.20 (0.61-2.36)	.60	0.86 (0.39-1.88)	.70
Use of Separation exercise feature
	1 vs 0 times	0.99 (0.65-1.53)	.97	1.58 (1.01-2.48)	.05	1.67 (0.98-2.83)	.06
	≥2 vs 0 times	2.05 (1.00-4.19)	.05	1.91(1.00-3.65)	.05	1.99 (0.94-4.22)	.07

^a All models adjusted for demographics, nicotine dependence, baseline quit attempts, peer smoking, household smoking, motivation to quit, positive and negative social support, health status, advice to quit from a health care provider, use of at least one cessation aide, baseline depression, baseline perceived stress, having a partner who smokes, and frequency of use of the Internet. Model 1 includes all covariates plus visits to the website. Model 2 includes all covariates, visits to the website, and use of specific BecomeAnEX.org features.

^b Represented as the log of total visits to the BecomeAnEX.org website over the study period.