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    Predictive validity of the PCL-R for offenders with intellectual disability in a high security hospital: Treatment progress

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    Author
    Morrissey, Catrin
    Mooney, Paul
    Hogue, Todd E.
    Keyword
    Antisocial personality disorder
    Mentally ill offenders
    Violence
    Checklist
    Confidence intervals
    Emotions
    Interpersonal relations
    Mentally disabled persons
    Personality assessment
    Psychological tests
    Security measures
    Intellectual disability
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    Date
    2007
    
    Metadata
    Show full item record
    DOI
    10.1080/13668250701383116
    Publisher's URL
    https://www.tandfonline.com/doi/full/10.1080/13668250701383116
    Abstract
    Background Among mainstream offenders, the severe personality disorder of psychopathy has considerable importance as a construct. The disorder has long been associated with failure to make treatment progress. Previous work has identified that psychopathy as a disorder occurs in samples of offenders with intellectual disability (ID), and suggests that the Psychopathy Checklist - Revised (PCL-R: Hare, 1991, 2003) as a measure of the disorder has adequate reliability and validity (Morrissey et al., 2005). The present study aimed to compare the predictive power of the PCL-R in relation to treatment progress with a more general assessment of violence risk, the HCR-20 (Webster, Douglas, Eaves, & Hart, 1997). Method A sample of 73 residents in a high security intellectual disability service, who had previously been assessed using the PCL-R and the HCR-20, were followed up at 2 years post-assessment, and their outcome determined in terms of two distinct dichotomous variables reflecting definite positive treatment progress and definite negative treatment progress respectively. Results In line with predictions, the PCL-R Total score and Factor 1 score (Interpersonal and Affective aspects of psychopathy) and the HCR-20 Total score were significantly inversely associated with a positive move from high to medium security hospital conditions within 2 years of assessment. However against prediction, the PCL-R Total score had incremental validity over the HCR-20. The PCL-R Total and Factor 1, but not the HCR-20 Total score, were also significantly associated with negative treatment progress in terms of a move to more restricted treatment conditions. Conclusion Psychopathy, and in particular its interpersonal and affective manifestations, is a construct which appears to be associated with indirect measures of treatment progress in this high security ID group. However, caution should be applied in the use of a construct with potentially negative connotations in an already devalued population.
    Citation
    Morrissey, C., Mooney, P., Hogue, T. E., Lindsay, W. R. & Taylor, J. L. (2007). Predictive validity of the PCL-R for offenders with intellectual disability in a high security hospital: Treatment progress. Journal of Intellectual and Developmental Disability, 32 (2), pp.125-133.
    Type
    Article
    URI
    http://hdl.handle.net/20.500.12904/9650
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