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Does the adapted sex offender treatment programme reduce cognitive distortions? A meta-analysis
Journal of Intellectual Disabilities and Offending Behaviour  (IF),  Pub Date : 2018-03-12, DOI: 10.1108/jidob-08-2017-0018
Chris Patterson

Purpose For the 3.8% of people with intellectual disabilities who have offended sexually, the main form of treatment is the group-based, cognitive-behavioural, Adapted Sex Offender Treatment Programme (ASOTP), that focuses upon challenging cognitive distortions condoning sex offending. This paper provides an evaluation of how effective the ASOTP is at reducing intellectual disability (ID) sex offenders’ cognitive distortions. Design/methodology/approach Three databases were searched systematically: PsycINFO, MEDLINE and Web of Science. Six studies met the inclusion criteria, yielding 118 participants. Using a random-effects model, effect sizes were calculated using pre- and post-treatment scores on a measure of cognitive distortions. The standardised mean difference (SMD) was 1.77 (95% CI: 1.06, 2.46), which was statistically significant (p < .001) and ‘large’. Sensitivity analysis demonstrated that this SMD was robust, and a check for publication bias revealed that it was unlikely that the ‘file drawer p...