Prospective dynamic assessment of risk of sexual reoffending in individuals with an intellectual disability and a history of sexual offending behaviour

Rachael E. Lofthouse, William R. Lindsay, Vasiliki Totsika, Richard P. Hastings, Douglas P. Boer, James L. Haaven

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Background
The purpose of the present study was to add to the literature on the predictive accuracy of a dynamic intellectual disability specific risk assessment tool.
Method
A dynamic risk assessment for sexual reoffending (ARMIDILO-S), a static risk assessment for sexual offending (STATIC-99), and a static risk assessment for violence (Violence Risk Appraisal Guide [VRAG]) were completed for a sample of 64 adult males with an intellectual disability.
Results
The dynamic risk assessment for sexual offenders with an intellectual disability resulted in the best prediction of sexual reoffending (ARMIDILO-S area under the curve (AUC) = 0.92) this was better than an established sexual offending static risk assessment (STATIC-99 AUC = 0.75). A static tool for violent reoffending, did not perform as well in this group (VRAG AUC = 0.58).
Conclusions
Results suggest that dynamic variables are useful in predicting sexual reoffending with individuals with an intellectual disability, confirming previous findings. The ARMIDILO-S is a promising dynamic risk assessment for individuals with an intellectual disability.
Original languageEnglish
Pages (from-to)394–403
Number of pages10
JournalJournal of Applied Research in Intellectual Disabilities
Volume26
Issue number5
Early online date8 Aug 2013
DOIs
Publication statusPublished - Sep 2013

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Intellectual Disability
Sexual Behavior
Violence
Area Under Curve

Cite this

Lofthouse, Rachael E. ; Lindsay, William R. ; Totsika, Vasiliki ; Hastings, Richard P. ; Boer, Douglas P. ; Haaven, James L. / Prospective dynamic assessment of risk of sexual reoffending in individuals with an intellectual disability and a history of sexual offending behaviour. In: Journal of Applied Research in Intellectual Disabilities. 2013 ; Vol. 26, No. 5. pp. 394–403.
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Prospective dynamic assessment of risk of sexual reoffending in individuals with an intellectual disability and a history of sexual offending behaviour. / Lofthouse, Rachael E.; Lindsay, William R.; Totsika, Vasiliki; Hastings, Richard P.; Boer, Douglas P.; Haaven, James L.

In: Journal of Applied Research in Intellectual Disabilities, Vol. 26, No. 5, 09.2013, p. 394–403.

Research output: Contribution to journalArticle

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AU - Hastings, Richard P.

AU - Boer, Douglas P.

AU - Haaven, James L.

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AB - BackgroundThe purpose of the present study was to add to the literature on the predictive accuracy of a dynamic intellectual disability specific risk assessment tool.MethodA dynamic risk assessment for sexual reoffending (ARMIDILO-S), a static risk assessment for sexual offending (STATIC-99), and a static risk assessment for violence (Violence Risk Appraisal Guide [VRAG]) were completed for a sample of 64 adult males with an intellectual disability.ResultsThe dynamic risk assessment for sexual offenders with an intellectual disability resulted in the best prediction of sexual reoffending (ARMIDILO-S area under the curve (AUC) = 0.92) this was better than an established sexual offending static risk assessment (STATIC-99 AUC = 0.75). A static tool for violent reoffending, did not perform as well in this group (VRAG AUC = 0.58).ConclusionsResults suggest that dynamic variables are useful in predicting sexual reoffending with individuals with an intellectual disability, confirming previous findings. The ARMIDILO-S is a promising dynamic risk assessment for individuals with an intellectual disability.

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