Sex crimes researchers R. Karl Hanson and Kelly E. Morton-Bourgon of Public Safety Canada conducted a large-scale meta-analysis (quantitative review) of recidivism rates among adult sex offenders. They found a rate of 14 percent over a period averaging five to six years. Recidivism rates increased over time, reaching 24 percent by 15 years. The figures are clearly out of alignment with the public’s more dire expectations.
https://www.scientificamerican.com/article/misunderstood-crimes/
Of the released sex offenders, 3.5 percent were reconvicted for a sex crime within the 3-year follow-up period, 24 percent were reconvicted for any new offense and 38.6 percent were returned to prison, either because they received another prison sentence or because of a parole violation.
https://www.bjs.gov/content/pub/press/rsorp94pr.cfm