Table 3.

Generalized Estimating Equation (GEE) Results for Outcomes During Follow-up

Percentage days abstinent (PDA) (N = 101)
Predictor	d	95% CI	χ2	p
Treatment condition	.010	−.372, .392	0.003	.959
Baseline PDA	.127	−.034, .288	2.382	.123
Baseline non-study SUD tx	.040	−.122, .201	0.231	.631
Time	−.018	−.099, .064	0.179	.673
Treatment x time	−.110	−.227, .007	3.382	.066

Inventory of Drug Use Consequences (InDUC) (N = 101)
Predictor	d	95% CI	χ2	p
Treatment condition	−.009	−.439, .260	0.252	.616
Baseline InDUC	.245	.078, .411	8.313	.004
Baseline non-study SUD tx	−.048	−.220, .124	0.294	.588
Time	−.081	−.149, −.013	5.421	.020
Treatment x time	.153	.054, .259	9.251	.002

Patient-reported Dyadic Adjustment Scale (DAS) (N = 98)
Predictor	d	95% CI	χ2	p
Treatment condition	.126	−.199, .452	0.578	.447
Baseline partner-reported DAS	.542	.405, .679	60.082	<.001
Baseline non-study SUD tx	.095	−.045, .236	1.767	.184
Time	.056	−.009, .121	2.896	.089
Treatment x time	−.150	−.244, −.057	9.874	.002

Partner-reported Dyadic Adjustment Scale (DAS) (N = 97)
Predictor	d	95% CI	χ2	p
Treatment condition	−.116	−.467, .235	0.419	.517
Baseline partner-reported DAS	.443	.307, .579	40.799	<.001
Baseline non-study SUD tx	.107	−.036, .250	2.140	.144
Linear time	−.246	−.493, .001	3.813	.051
Quadratic time	.042	.004, .080	4.686	.030
Treatment x linear time	−.125	−.236, −.013	4.806	.028

Note. Coding for treatment condition: 0 = group behavioral couples therapy, 1 = standard behavioral couples therapy. An autoregressive dependent variable correlation matrix was used for PDA and DAS, and an unstructured dependent variable correlation matrix was used for InDUC.