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International Journal of Offender Therapy and Comparative Criminology
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Effect Sizes in the Treatment of Sexual Offenders

W. L. Marshall

Rockwood Psychological Services 303 Bagot Street, Suite 403 Kingston, Ontario, K7K 5W7 Canada

J. McGuire

Department of Clinical Psychology Whelan Building, The Quadrangle University of Liverpool Liverpool L69 3GB United Kingdom

This article considers the benefits of sexual offender treatment in terms of the magnitude of the effect size produced by these interventions. Comparisons are made of the effect sizes with those generated by treatment of other offenders, by treatment for mental health problems, and by treatment for physical health problems. In all cases, effect sizes with sexual offenders are comparable to (and in some cases better than) effect sizes for the treatment of the other groups. As a final note, it is suggested that using a harm reduction index to estimate effect sizes for treatment with sexual offenders would produce more meaningful results.

Key Words: sexual offenders • effect size • outcome • treatment

International Journal of Offender Therapy and Comparative Criminology, Vol. 47, No. 6, 653-663 (2003)
DOI: 10.1177/0306624X03256663
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