Table 2.

Test Statistics, p Values, and Means (Standard Errors) from Intent-to-treat Inferential Analyses for Substance Use Outcome Measures (N=128)

		Treatment Condition					Time					Treatment Condition × Time
													RBT			Usual Care
			R B T	Us ua l Ca re			Bas elin e	Post- Treat ment	3- mo nth Foll ow- up			Bas elin e	Post- Trea tmen t	3- mo nth Foll ow- up	Bas elin e	Post- Trea tmen t	3- mo nth Foll ow- up
	χ 2	p	Mean (SE)		χ2	p	Mean (SE)			χ 2	p			Mean (SE)
Urine drug screening test result for buprenorphine: yes
Urine drug screening test result for methadone: yes
Urine drug screening test result for opioids: yes	3.6	0.6	20 (.04)	.33 (.05)	107	<.001	.67 (.04)	.18 (.04)	.09 (.03)	.9	.65	.63 (06)	.15 (.05)	.05 (.03)	.72 (.06)	.21 (05)	.14 (.05)
Urine drug screening test result for benzodiazepines : yes	.0	.93	.29 (.05)	.29 (.04)	22.4	<.001	.46 (.04)	.22 (.04)	.22 (.04)	1.3	.52	.47 (.06)	.20 (.05)	.25 (.06)	.45 (.06)	.25 (.06)	.20 (.05)
Urine drug screening test result for amphetamines: yes	.8	.39	.10 (.03)	.13 (.03)	29.6	<.001	.28 (.04)	.06 (.02)	.08 (.03)	1.7	.44	.30 (.06)	.04 (.03)	.07 (.04)	.27 (.06)	.09 (.04)	.09 (.04)
Urine drug screening test result for cannabis : yes	2.3	.13	.06 (.02)	.12 (.03)	4.4	.11	.12 (.03)	.04 (.02)	.11 (.03)	2.7	.26	.11 (.04)	.02 (.02)	.11 (.04)	.14 (.04)	.11 (.04)	.13 (.04)
Breathalyzer test result for alcohol : yes	.1	.74	.04 (.02)	.05 (.02)	2.7	.26	.04 (.02)	.03 (.02)	.08 (.03)	2.5	2.9	.06 (.03)	.02 (.02)	.05 (.03)	.03 (.02)	.04 (.02)	.11 (.04)

Notes. For the Treatment Condition main effect, df = 1; for the Time main effect df = 2; for the Treatment Condition × Time, df = 2. Analyses for buprenorphine and methadone failed to converge due to cells with 0 values.