Table 3.

Effects of social network predictors and propensity stratification on drinking outcomes at study Month 39, outpatient arm

Effect	Percentage of days abstinent			Drinks per drinking day
	F	df	p	F	df	p
Pro-abstainer main effect	4.13	5,126601	.0010	2.32	5,94846	.0404
Pro-abstainer by strata interaction	2.58	1,27362	.1083	0.88	1, 12006	.3492
Stratification main effect	2.56	4, 1.77E6	.0366	1.45	4, 1.42E6	.2146
Pro-drinker main effect	12.00	4,141161	<.0001	7.05	4,115657	<.0001
Pro-drinker by strata interaction	2.53	4, 7357.8	.1115	0.29	4, 7658.7	.5876
Stratification main effect	1.35	4,143000	.2482	1.31	4, 1.87E6	.2618