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Sexual Abuse: A Journal of Research and Treatment
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First Report of the Collaborative Outcome Data Project on the Effectiveness of Psychological Treatment for Sex Offenders

R. Karl Hanson

Corrections Research, Department of the Solicitor General of Canada, Ottawa, Canada, hansonk{at}sgc.gc.ca

Arthur Gordon

Clearwater Treatment Centre, Monroe, Washington

Andrew J. R. Harris

Corrections Research, Department of the Solicitor General of Canada, Ottawa, Canada

Janice K. Marques

California Department of Mental Health, Sacramento, California

William Murphy

University of Tennessee-Memphis, Memphis, Tennessee

Vernon L. Quinsey

Queen's University, Kingston, Ontario

Michael C. Seto

Centre for Addiction and Mental Health, Toronto, Ontario

This meta-analytic review examined the effectiveness of psychological treatment for sex offenders by summarizing data from 43 studies (combined n = 9,454). Averaged across all studies, the sexual offence recidivism rate was lower for the treatment groups (12.3%) than the comparison groups (16.8%, 38 studies, un-weighted average). A similar pattern was found for general recidivism, although the overall rates were predictably higher (treatment 27.9%, comparison 39.2%, 30 studies). Current treatments (cognitive-behavioral, k = 13; systemic, k = 2) were associated with reductions in both sexual recidivism (from 17.4 to 9.9%) and general recidivism (from 51 to 32%). Older forms of treatment (operating prior to 1980) appeared to have little effect. Future directions for improving the quality of sex offender treatment outcome evaluations are discussed.

Key Words: sex offender treatment • evaluation • recidivism • meta-analysis.

Sexual Abuse: A Journal of Research and Treatment, Vol. 14, No. 2, 169-194 (2002)
DOI: 10.1177/107906320201400207
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