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Reliability and validity of the Static-99R in sex offenders with intellectual disabilities

Claudia Pouls (Claudia Pouls and Inge Jeandarme are both based at the Knowledge Centre Forensic Psychiatric Care, OPZC Rekem, Rekem, Belgium)
Inge Jeandarme (Claudia Pouls and Inge Jeandarme are both based at the Knowledge Centre Forensic Psychiatric Care, OPZC Rekem, Rekem, Belgium)

Journal of Intellectual Disabilities and Offending Behaviour

ISSN: 2050-8824

Article publication date: 7 December 2021

Issue publication date: 20 January 2022

287

Abstract

Purpose

Risk assessment studies involving recidivism in sex offenders with intellectual disabilities (SOIDs) continue to be scarce, limited and producing mixed results. This study aims (to test the ability ...) to test the ability of one such instrument (the Static-99R) to predict intramural sexual and violent incidents involving members of this group.

Design/methodology/approach

The Static-99R was prospectively scored for 38 SOIDs. Occurrences of any violent or sexual incident and/or illegal sexual behaviour were recorded during a minimum period of six months. Predictive accuracy was analysed using several performance indicators.

Findings

The Static-99R significantly predicted sexual incidents (area under the curve = 0.70) but failed to predict violent and illegal sexual incidents. Regarding illegal sexual incidents, the instrument was better at detecting low-risk individuals than high-risk offenders.

Originality/value

Risk assessment studies, both in offenders with and without an intellectual disability (ID), rarely use multiple accuracy estimates. The current study used both discrimination and calibration indicators to evaluate the ability of the Static-99R to detect low- and high-risk offenders.

Keywords

Acknowledgements

We would like to thank the participating clients and institutions: A.B.A.G.G. (’t Zwart Goor), Amanis (‘t Zwart Goor), Itinera (Sint-Idesbald), Limes (Sint-Ferdinand), Ontgrendeld (OBRA), KFP (APZ Sint-Lucia), and Forensische Zorg 4 (OPZC Rekem). Furthermore, we would like to thank the Federal Government of Justice.

Funding: This project was funded by the Public Psychiatric Care Centre Rekem (OPZC Rekem).

Citation

Pouls, C. and Jeandarme, I. (2022), "Reliability and validity of the Static-99R in sex offenders with intellectual disabilities", Journal of Intellectual Disabilities and Offending Behaviour, Vol. 13 No. 1, pp. 20-31. https://doi.org/10.1108/JIDOB-08-2021-0013

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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