Assessing measurement invariance of PCL-R assessments from file reviews of North American and German offenders

Cross-cultural research on psychopathy necessitates assessment methods that are generalizable across linguistic and cultural differences. Multiple-group confirmatory factor analysis was used to compare the factorial structure of Psychopathy Checklist-Revised (PCL-R) assessments obtained from file reviews of North-American (N = 2622) and German (N = 443) male offenders. The analyses indicated that the 18 item, 4-factor model of the PCL-R obtained with the standard PCL-R protocol (interview and file review) also holds for file review data. On a factor-by-factor level, the data are commensurate with strong factorial invariance of factor loadings and item thresholds for the Interpersonal and Lifestyle factors, and with likely metric invariance for the Affective factor. The Antisocial factor showed structural differences between the two samples. The results imply that cultural or environmental factors more strongly influence the judgment and/or expression of antisociality. Based on the results, cross-cultural comparisons between North-American and German offenders in terms of PCL-R psychopathy should be limited to the Interpersonal and Lifestyle factors. Further research using data obtained through the standard protocol (i.e., interview plus file information) is encouraged.