Structural, item, and test generalizability of the psychopathology checklist - revised to offenders with intellectual disabilities

Morrissey, Catrin, Cooke, David, Michie, Christine, Hollin, Clive, Hogue, Todd, Lindsay, William and Taylor, John (2010) Structural, item, and test generalizability of the psychopathology checklist - revised to offenders with intellectual disabilities. Assessment, 17 (1). pp. 16-29. ISSN 1552-3489

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Official URL: http://dx.doi.org/10.1177/1073191109344052

Abstract

The Psychopathy Checklist–Revised (PCL-R) is the most widely used measure of psychopathy in forensic clinical practice, but the generalizability of the measure to offenders with intellectual disabilities (ID) has not been clearly established. This study examined the structural equivalence and scalar equivalence of the PCL-R in a sample of 185 male offenders with ID in forensic mental health settings, as compared with a sample of 1,212 male prisoners without ID. Three models of the PCL-R’s factor structure were evaluated with confirmatory factor analysis. The 3-factor hierarchical model of psychopathy was found to be a good fit to the ID PCL-R data, whereas neither the 4-factor model nor the traditional 2-factor model fitted. There were no cross-group differences in the factor structure, providing evidence of structural equivalence. However, item response theory analyses indicated metric differences in the ratings of psychopathy symptoms between the ID group and the comparison prisoner group. This finding has potential implications for the interpretation of PCL-R scores obtained with people with ID in forensic psychiatric settings.

Item Type: Article
Uncontrolled Keywords: learning disabilities, psychology, pathological, learning disability, intelligence, item response theory
Subjects: L300 Sociology
L900 Others in Social studies
Department: Faculties > Health and Life Sciences > School of Health, Community and Education Studies > Social Work, Education and Community Wellbeing
Depositing User: EPrint Services
Date Deposited: 26 Nov 2010 14:24
Last Modified: 12 May 2017 16:51
URI: http://nrl.northumbria.ac.uk/id/eprint/3054

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