Table 3. Results from logistic regression predicting substance free samples at follow-up evaluations.

	Follow-up completers only			Follow-up non-completers as relapsed
Variable	Beta (SE)	Wald (df)	p value	Beta (SE)	Wald (df)	p value
Baseline variables	N = 296		Month 6	N = 360
Site		4.74 (3)	.19		4.07 (3)	.25
Male gender	−0.31 (0.27)	1.34 (1)	.25	−0.46 (0.24)	3.62 (1)	.06
Age	−0.02 (0.01)	2.76 (1)	.10	−0.01 (0.01)	1.07 (1)	.30
Income	0.00 (0.00)	3.52 (1)	.06	0.00 (0.00)	3.40 (1)	.07
Cocaine negative	0.30 (0.39)	0.63 (1)	.43	0.09 (0.37)	0.05 (1)	.82
Opioid negative	0.03 (0.54)	0.00 (1)	.96	0.06 (0.51)	0.01 (1)	.91
THC negative	0.78 (0.46)	2.87 (1)	.09	0.49 (0.45)	1.19 (1)	.27
During treatment	variables
Days attended	0.04 (0.02)	4.01 (1)	< .05	0.05 (0.01)	8.92 (1)	< .01
% Negative	0.02 (0.01)	8.64 (1)	< .01	0.01 (0.00)	7.98 (1)	< .01
Baseline variables	N = 292		Month 9	N = 360
Site		7.06 (3)	.07		3.64 (3)	.45
Male gender	0.15 (0.26)	0.00 (1)	.95	−0.10 (0.24)	0.17 (1)	.68
Age	−0.01 (0.01)	0.75 (1)	.39	−0.00 (0.01)	0.06 (1)	.81
Income	0.00 (0.00)	3.57 (1)	.06	0.00 (0.00)	2.73 (1)	.10
Cocaine negative	0.38 (0.39)	0.97 (1)	.33	0.21 (0.37)	0.32 (1)	.56
Opioid negative	−0.06 (0.56)	0.01 (1)	.92	0.14 (0.51)	0.08 (1)	.78
THC negative	0.32 (0.45)	0.50 (1)	.48	0.16 (0.43)	0.13 (1)	.74
During treatment
Days attended	0.03 (0.02)	3.80 (1)	< .05	0.04 (0.02)	8.03 (1)	< .01
% Negative	0.01 (0.01)	4.95 (1)	< .05	0.01 (0.01)	4.70 (1)	< .03