Table 2.

Effects of social network predictors and propensity stratification on drinking outcomes at study Month 15, outpatient arm

Effect	Percentage of days abstinent			Drinks per drinking day
	F	df	p	F	df	p
Pro-abstainer main effect	7.27	5,30809	<.0001	2.86	5,32311	.0139
Pro-abstainer by strata interaction	2.71	1,7941.1	.0996	3.61	4,4149.5	.0577
Stratification main effect	1.68	4,44782	.1511	0.97	4, 36686	.4239
Pro-drinker main effect	13.77	5,25022	<.0001	10.07	5,29718	<.0001
Pro-drinker by strata interaction	0.01	1,3088.2	.9029	0.00	1,2448.8	.9880
Stratification main effect	0.25	4, 43675	.9088	0.26	4,32391	.9047