Drug use and treatment success among gang and non-gang members in El Salvador: a prospective cohort study

Table 1 Changes in DAT outcomes

	Past month any illegal substance use		Frequency of past month binge drinking		Past month crime		Past 6 mo. gang risk activity
	t	OR	t	r	t	OR	t	r
Intercept	1.32	2.05	7.83**	.88	1.51	2.17	8.59**	.90
Inv. Mills	−2.23*	.39	−1.76+	-.07	−2.59*	.35	−2.52*	-.10
Time	−10.26**	.15	−15.72**	-.43	−9.84**	.17	−15.16**	-.42
	χ²	ICC	χ²	ICC	χ²	ICC	χ²	ICC
Repeated Observation Variance	675.22*	.16	718.18**	.08	632.54	.08	1543.42**	.47
Center Variance	53.44**	.08	47.04**	.03	45.79**	.05	19.86	.00

** p < .01, * p < .05, + p < .10; N = 625; t-tests are based on 18 df for the intercept, 623 df for the inverse Mill’s ratio, and 1070 df for time; effect size r calculated using the formula reported in Cohen [26]: r = [ t² / ( t² + df ) ]^.5.

ISSN: 1747-597X