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Table 4 Multiple regression testing the effects of predictor variables on the normalized composite neuropsychological performance score.

From: Character pathology and neuropsychological test performance in remitted opiate dependence

Subjects Predictor Standardized Coefficient R2 ANOVA
All Composite MCMI β = -0.572; 0.327 F = 25.312
   t = -5.031;   df = 1, 52
   p < 0.001   p < 0.001
MM + PA Composite MCMI β = -0.429; 0.185 F = 3.52;
   t = -2.65;   df = 2, 31;
   p = 0.013   p = 0.042
  Age at first drug use β = -0.01;   
   t = -0.061;   
   p = 0.952   
MM + PA Composite MCMI β = -0.434; 0.188 F = 3.94;
   t = -2.8;   df = 2, 34;
   p = 0.008   p = 0.029
  Years of heroin addiction β = 0.003;   
   t = 0.022;   
   p = 0.982   
MM + PA Composite MCMI β = -0.398; 0.163 F = 0.2.82;
   t = -2.34;   df = 2, 29;
   p = 0.026   p = 0.076
  Estimated dollars spent daily on heroin β = 0.085;   
   t = 0.50;   
   p = 0.622   
MM + PA Composite MCMI β = -0.437; 0.195 F = 4.12;
   t = -2.84;   df = 2, 34;
   p = 0.008   p = 0.025
  Years of MMT β = -0.083;   
   t = -0.536;   
   p = 0.596   
MM + PA Composite MCMI β = -0.344; 0.196 F = 3.41;
   t = -1.97;   df = 2, 28;
   p = 0.058   p = 0.047
  Highest dose of methadone β = 0.21;   
   t = 1.21;   
   p = 0.238   
  1. MM – Methadone Maintained, PA – Protracted Abstinence, MCMI – Millon Clinical Multi-axial Inventory.