International Journal of Offender Therapy and Comparative Criminology

 

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First published on August 23, 2007, doi:10.1177/0306624X07305826

International Journal of Offender Therapy and Comparative Criminology 2008;52:401.

A more recent version of this article appeared on August 1, 2008
 © 2007 SAGE Publications

Article

Are the Mentally Retarded and Learning Disordered Overrepresented Among Sex Offenders and Paraphilics?

Ron Langevin1* and Suzanne Curnoe2

1 Juniper Associates, Etobicoke, Ontario, Canada; University of Toronto, Ontario, Canada
2 Juniper Associates, Etobicoke, Ontario, Canada

* To whom correspondence should be addressed. E-mail: langevin95{at}sympatico.ca.


  Abstract
A sample of 2,286 male sex offenders and paraphilics and 241 nonsex offenders was evaluated for the prevalence of mental retardation and learning disorders, using the full Wechsler IQ scales. The sex offenders were generally of average intelligence, and the mentally retarded were not overrepresented among them, but the learning disordered were. There were no differences among sex offenders and controls in overall IQ or in the percentage of mentally retarded or learning-disordered cases, suggesting that the learning difficulties are not peculiar to sex offenders. There was a bias in referral source, with more mentally retarded, borderline-retarded, and/or learning-disordered cases being referred by the Children’s Aid Society, prisons, and the Crown, suggesting that referral source may play a significant role in evaluating intelligence and mental retardation among sex offenders; but the overrepresentation of learning disorders among criminals appears to be a significant phenomenon, regardless of referral source.
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