Assessing reconviction, reoffending and recidivism in a sample of UK sexual offenders

Purpose. The rate of sexual reconviction for sexual offenders is known to be low. Sexual reconviction, however, is currently the most commonly used outcome measure in sex offender treatment evaluation studies. It is expected that sex offender treatment programmes will reduce the likelihood of reconviction amongst participants. A low base rate of sexual reconviction means that any reduction in reconviction (which could be attributed to treatment) will be small and unlikely to be statistically significant. This study aimed to assess other offence‐related outcomes for sexual offenders, in addition to reconviction. Methods. The sample comprised 173 sexual offenders who had completed a community sex offender treatment programme. Follow‐up information was collected forthe sample from programme files containing multi‐agency information. Official reconviction rates were also calculated using both Home Office and police data. Results. Collecting evidence of any offence‐related sexual behaviour during this study multiplied the sample's sexual reconviction rate by a factor of 5.3. Conclusions. The results show that broadening the outcome measure under observation indicates a higher level of offence‐related sexual behaviour displayed by sexual offenders than reflected by reconviction data. These results have implications for the outcomes measured in treatment evaluation research for sexual offenders.