Incremental validity of the psychological inventory of criminal thinking styles and psychopathy checklist: Screening version in predicting disciplinary outcome

A group of 136 male inmates housed in a medium security federal correctional institution were followed for a period of 24 months for evidence of disciplinary infractions (incident reports) after completing the Psychological Inventory of Criminal Thinking Styles (PICTS) and being scored on the Psychopathy Checklist: Screening Version (PCL:SV). Age, prior incident reports, the PICTS General Criminal Thinking (GCT) score, and the PCL:SV total score were included in a series of negative binomial regressions and Receiver Operating Characteristic (ROC) analyses of three increasingly more serious outcomes: total incident reports, major incident reports, and aggressive incident reports. Results indicated that the PICTS GCT score and PCL:SV total score were incrementally valid predictors of all three outcomes, with the strongest effects occurring when more severe incident reports were predicted. On the other hand, only the PICTS GCT score and Proactive Criminal Thinking (P) scale produced more than one significant ROC finding.