TABLE 3.

GEE models of between-group differences in past 30-day alcohol outcomes across the three-month study period.

Variable	Total Drinking Days			Total Binge Drinking Days			Average Drinks/Drinking Day			Alcohol-Related Problems
	IRR	p	95% CI	IRR	p	95% CI	IRR	p	95% CI	IRR	p	95% CI
Behavior at baseline1	1.05	<.001	1.04-107	1.14	<.001	1.09-1.19	1.09	.002	1.03-1.15	1.01	.081	0.99-1.03
Time	1.02	.504	0.97-1.06	1.04	.429	0.94-1.15	0.95	.225	0.87-1.03	0.95	.117	0.89-1.01
Intervention condition	0.73	.002	0.61-0.89	0.76	.051	0.48-1.01	0.97	.777	0.77-1.21	0.83	.047	0.68-0.99
Within-month contrasts
Month 1	0.82	.017	0.70-0.97	1.03	.861	0.71-1.50	1.01	.948	0.72-1.42	1.12	.406	0.86-1.45
Month 2	0.65	<.001	0.54-0.76	0.68	.047	0.46-0.99	1.06	.753	0.74-1.50	0.96	.762	0.74-1.25
Month 3	0.81	.009	0.69-0.95	0.86	.412	0.59-1.24	1.08	.674	0.76-1.53	0.71	.017	0.54-0.94

Note.

¹Term represents participants’ baseline values of each outcome.