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Table 2 Results of mixed effects regression on substance use outcomes (n = 142)

From: Psycho-education for substance use and antisocial personality disorder: a randomized trial

Dependent variable   Coefficient 95 % CI P-value
ASI Drugs CS ILC intercept 0.001 −0.026 to 0.046 0.588
  3 months 0.015 −0.017 to 0.047 0.362
  9 months −0.052 −0.086 to−0.019 0.002
  ILC X 3 months −0.052 −0.096 to−0.009 0.018
  ILC X 9 months −0.004 −0.049 to 0.042 0.872
  ICC site 0.017 0.000 to 0.361  
  ICC Patient 0.335 0.234 to 0.455  
  Wald χ 2(8) 93.90   0.000
ASI Alcohol CS ILC intercept −0.012 −0.077 to 0.052 0.708
  3 months −0.041 −0.092 to 0.010 0.134
  9 months −0.066 −0.120 to−0.112 0.016
  ILC X 3 months 0.008 −0.061 to 0.077 0.814
  ILC X 9 months 0.049 −0.023 to 0.121 0.182
  ICC Site 0.072 0.016 to 0.272  
  ICC Patient 0.506 0.402 to 0.610  
  Wald χ 2(8) 16.24   0.039
Days abstinent ILC intercept −2.300 −6.179 to 1.580 0.245
  3 months 0.970 −4.027 to 2.088 0.534
  9 months 2.359 −0.863 to 5.810 0.151
  ILC X 3 months 4.319 0.183 to 8.456 0.041
  ILC X 9 months 3.584 −0.751 to 7.919 0.105
  ICC Site 0.005 0.000 to 1.000  
  ICC Patient 0.471 0.369 to 0.576  
  Wald χ 2(8) 31.17   0.000
  1. All analyses adjusted for site and individual, gender, age, and substitution at baseline
  2. TAU Treatment as usual, ILC Impulsive lifestyle counselling, ASI Addiction Severity Index, CS Composite score, ICC Intraclass correlation