Table 2.

Summary of Tests of Treatment Effects on Outcome Variables. Values Shown are Parameter Estimates from Multilevel Models (for Continuous Outcome Measures) or Estimates and χ2 Values from a Generalized Estimating Equations Analysis (for the Binary 90-Day Abstinence Measure).

Dependent Variable	Treatmenta (df=1, 1481)			Timeb (df=1,181)			Treatment X Time (df=1, 1498)
	B	se	t	B	se	t	B	se	t
Proportion Days Abstinent (PDA)	.054	.022	2.42*	.012	.002	5.76***	.001	.003	0.15
Proportion Heavy Drinking Days (PDH)	−.027	.022	1.24	−.010	.002	−5.51***	−.000	.003	−0.13
Drinks/Drinking Dayc (DDD)	−.055	.056	0.98	−.025	.005	−4.87***	−.001	.007	−0.10
DrINC Scored	−4.451	2.266	−1.96*	−.864	.164	−5.26***	.080	.233	−0.35
	B	se	χ2	B	se	χ2	B	se	χ2
90-Day Abstinence e,f	.332	.308	1.20	.027	.011	12.25***	−.010	.017	0.37

B=unstandardized estimate; se=standard error; t= t statistic

^aTreatment coded: PCBT=-1; NS= 1.

^bTime effect refers to change per month during period from baseline to 27 months.

^cDrinks/Drinking Day was log transformed

^dThe DrINC was administered on fewer occasions than the other instruments: df_Treatment=1, 606; df_Time=1, 169; df_{Treatment X Time}= 1, 606.

^eBaseline PDA used as a covariate in this model.

^fOnly numerator df applies in this analysis.

Note:

^*p < .05;

^***p < .001. df = degrees of freedom.