TABLE 2.

Mixed Logistic Regression Analysis of Having a Negative Urinalysis Result for Methamphetamine One Year Following Treatment

Variable	Full Sample (N = 871)		Treatment as Usual (N = 436)		16-Week Matrix (N = 435)
	OR	95% CI	OR	95% CI	OR	95% CI
Performance
Engagement	0.93	0.63, 1.36	0.96	0.52, 1.77	1.08	0.50, 2.33
Three Consecutive Negative Urines During Treatment	2.82***	2.04, 3.90	3.05**	1.47, 6.31	2.94***	2.04, 4.22
Proportion of Expected Length of Treatment R Retained	0.98	0.47, 2.06	1.22	0.44, 3.42	0.82	0.29, 2.36
Demographics
Age	0.97**	0.94, 0.99	0.99	0.95, 1.03	0.95***	0.93, 0.98
Female	0.93	0.60, 1.44	1.29	0.78, 2.13	0.73	0.40, 1.34
White (vs. other)	0.90	0.69, 1.16	0.60	0.33, 1.09	1.14	0.79, 1.64
Living Arrangement at Baseline (vs. with Partner)
No Partner, Alone or with Children	0.88	0.68, 1.14	0.95	0.67, 1.36	0.99	0.71, 1.38
With Others	1.01	0.74, 1.39	1.14	0.68, 1.92	0.98	0.68, 1.42
In Controlled Environment	1.65	0.95, 2.86	2.45	0.58, 10.25	1.52	0.51, 4.52
In an Unstable Situation	0.43*	0.22, 0.83	0.48	0.19, 1.19	0.42**	0.24, 0.73
Lived with AOD User at Baseline	0.69	0.45, 1.06	0.78	0.47, 1.30	0.62	0.38, 1.01
Usual Baseline Employment Status (vs. not Working)
Full-time	1.18	0.69, 2.02	1.56	0.76, 3.22	0.82	0.40, 1.66
Part-time	1.58	0.78, 3.18	1.85	0.95, 3.63	1.17	0.33, 4.22
Substance Abuse History
# AOD Treatments between Baseline and One-Year Follow-up	1.60***	1.27, 2.00	1.92**	1.24, 2.96	1.45	0.78, 2.70
# Days in Past 30 used Meth at Baseline	0.98	0.95, 1.01	0.97	0.93, 1.01	0.98	0.95, 1.02

Note: SAS PROC GLIMMIX was used for analyses. A random-intercept model was specified, using site as the clustering variable. OR = odds ratio, CI = confidence interval.

^*p < .05.

^**p < .01.

^***p < .001.