Table 5.

Results of random-effect regression for opiate and cocaine use

	Opiate			Cocaine
Parameter	Estimate	SE	z	Estimate	SE	z
Intercept (at Time 0)	−2.10	0.39	−5.37**	−1.60	0.26	−6.14**
Time (per 1 month)	0.06	0.03	1.93*	−0.08	0.04	−2.29*
Group (DC vs. RPMG)	0.43	0.46	.95	−0.43	0.29	−1.50
Group × Time	−0.12	0.04	3.03**	0.01	0.04	.25

Note: n = 50; no records were available for 2 of the 52 women in the sample.

^*p < .05, one-tailed.

^**p < .01, one-tailed.