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The 2-year test-retest reliability of the Psychopathy Checklist Revised in methadone patients
M Rutherford1, J S Cacciola, A I Alterman
1Alcohol and Drug Abuse Institute, University of Washington, Seattle 90105-6696, USA. mruthfrd@u.washington.edu
Abstract:
The 2-year test-retest reliability of the Psychopathy Checklist-Revised (PCL-R) was examined in 200 men and 25 women methadone patients. Stability of the PCL-R was generally good whether it was evaluated as a dichotomous or dimensional measure. Utilizing a diagnostic cutoff score of 25 or more the intraclass correlation coefficients (ICCs) were.48 for men and.67 for women. For the Total PCL-R score ICCs were.60 and.65 for men and women, respectively. Factor 1 was more reliably measured in women compared to men (.63 vs.43). For men, Factor 1 was significantly less reliable than Factor 2 or the Total score. For women, Factor 2 was significantly less reliable than the Total PCL-R score or Factor 1.