Source: (2007) Ottawa, Ontario: Correctional Services of Canada. Research Branch.

Results show that the offenders who participated in COSA had significantly lower rates of any type of reoffending than did the matched comparison offenders who did not participate in COSA. Specifically, offenders who participated in COSA had an 83% reduction in sexual recidivism in contrast to the matched comparison group (2.1% vs. 12.8%), a 73% reduction in all types of violent recidivism (including sexual – 8.5% vs. 31.9%), and an overall reduction of 72% in all types of recidivism (including violent and sexual – 10.6% vs. 38.3%). Overall, COSA participants were responsible for considerably less sexual, violent, and general offending in comparison to the matched comparison group. (excerpt)

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