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Table 2 Changes in DAT outcomes by gang membership

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

  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 1.65 2.99 5.83** .81 2.60* 5.68 11.20** .94
Inv. Mills −2.32* .37 −1.75+ -.07 −2.70** .33 −2.91** -.12
Gang Membership 3.20** 3.53 -.12 .00 3.11** 3.76 11.98** .43
Time −6.21** .10 −5.56** -.17 −6.55** .07 −13.06** -.37
Interaction −1.11 .67 1.55 .05 −2.41* .37 −6.77** -.20
  χ2 ICC χ2 ICC χ2 ICC χ2 ICC
Repeated Observation Variance 664.56* .16 723.99** .08 625.12 .09 1319.41** .40
Center Variance 57.18** .09 46.92** .03 43.39** .05 24.90 .01
  1. ** p < .01, * p < .05, + p < .10; N = 625; t-tests are based on 18 df for the intercept, 622 df for the inverse Mill’s ratio and the gang membership main effect, and 1068 df for time and the interaction; effect size r calculated using the formula reported in Cohen [26]: r = [ t2 / ( t2 + df ) ].5.