Predicting institutional violence in offenders with intellectual disabilities: The predictive efficacy of the VRAG and the HCR-20

Suzanne Fitzgerald; Nicola S. Gray; Regi T. Alexander; Ruth Bagshaw; Paul Chesterman; Phillip Huckle; Susan K. Jones; John Taylor; Tegwyn Williams; Robert J. Snowden

doi:10.1111/jar.12032

Predicting institutional violence in offenders with intellectual disabilities: The predictive efficacy of the VRAG and the HCR-20

Suzanne Fitzgerald, Nicola S. Gray, Regi T. Alexander, Ruth Bagshaw, Paul Chesterman, Phillip Huckle, Susan K. Jones, John Taylor, Tegwyn Williams, Robert J. Snowden

Norwich Medical School

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

Background: There is a developing evidence base to support the use of risk assessment instruments in offenders with intellectual disability (ID). The aim of this study was to try to develop this literature with the inclusion of a control group of mentally disordered offenders without an ID, using the HCR-20 and VRAG.

Materials and Methods: The VRAG and the HCR-20 were completed for a group of offenders with an ID (n = 25) and a control group (n = 45), in four medium-secure units across the UK. The outcome measure was physical aggression measured over 6 months.

Results: Both instruments consistently produced large effect sizes predicting any physical aggression and severe physical aggression. The structured clinical judgement based on the HCR-20 was especially good.

Conclusions: The HCR-20 and the VRAG have excellent predictive efficacy in offenders with an ID. A structured clinical judgement based on the HCR-20 was especially predictive.

Original language	English
Pages (from-to)	384-393
Number of pages	10
Journal	Journal of Applied Research in Intellectual Disabilities
Volume	26
Issue number	5
DOIs	https://doi.org/10.1111/jar.12032
Publication status	Published - 1 Sep 2013

Keywords

actuarial measures
intellectual disabilities
risk assessment
structured clinical judgement

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1111/jar.12032

Cite this

Fitzgerald, S., Gray, N. S., Alexander, R. T., Bagshaw, R., Chesterman, P., Huckle, P., Jones, S. K., Taylor, J., Williams, T., & Snowden, R. J. (2013). Predicting institutional violence in offenders with intellectual disabilities: The predictive efficacy of the VRAG and the HCR-20. Journal of Applied Research in Intellectual Disabilities, 26(5), 384-393. https://doi.org/10.1111/jar.12032

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title = "Predicting institutional violence in offenders with intellectual disabilities: The predictive efficacy of the VRAG and the HCR-20",

abstract = "Background: There is a developing evidence base to support the use of risk assessment instruments in offenders with intellectual disability (ID). The aim of this study was to try to develop this literature with the inclusion of a control group of mentally disordered offenders without an ID, using the HCR-20 and VRAG. Materials and Methods: The VRAG and the HCR-20 were completed for a group of offenders with an ID (n = 25) and a control group (n = 45), in four medium-secure units across the UK. The outcome measure was physical aggression measured over 6 months. Results: Both instruments consistently produced large effect sizes predicting any physical aggression and severe physical aggression. The structured clinical judgement based on the HCR-20 was especially good. Conclusions: The HCR-20 and the VRAG have excellent predictive efficacy in offenders with an ID. A structured clinical judgement based on the HCR-20 was especially predictive.",

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Fitzgerald, S, Gray, NS, Alexander, RT, Bagshaw, R, Chesterman, P, Huckle, P, Jones, SK, Taylor, J, Williams, T & Snowden, RJ 2013, 'Predicting institutional violence in offenders with intellectual disabilities: The predictive efficacy of the VRAG and the HCR-20', Journal of Applied Research in Intellectual Disabilities, vol. 26, no. 5, pp. 384-393. https://doi.org/10.1111/jar.12032

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T1 - Predicting institutional violence in offenders with intellectual disabilities: The predictive efficacy of the VRAG and the HCR-20

AU - Fitzgerald, Suzanne

AU - Gray, Nicola S.

AU - Alexander, Regi T.

AU - Bagshaw, Ruth

AU - Chesterman, Paul

AU - Huckle, Phillip

AU - Jones, Susan K.

AU - Taylor, John

AU - Williams, Tegwyn

AU - Snowden, Robert J.

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AB - Background: There is a developing evidence base to support the use of risk assessment instruments in offenders with intellectual disability (ID). The aim of this study was to try to develop this literature with the inclusion of a control group of mentally disordered offenders without an ID, using the HCR-20 and VRAG. Materials and Methods: The VRAG and the HCR-20 were completed for a group of offenders with an ID (n = 25) and a control group (n = 45), in four medium-secure units across the UK. The outcome measure was physical aggression measured over 6 months. Results: Both instruments consistently produced large effect sizes predicting any physical aggression and severe physical aggression. The structured clinical judgement based on the HCR-20 was especially good. Conclusions: The HCR-20 and the VRAG have excellent predictive efficacy in offenders with an ID. A structured clinical judgement based on the HCR-20 was especially predictive.

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