 Risk for re-offense was highest in the first 6 years after release, but continued to be significant even 10–31 years later, with 23% offending during this time.A study done in California in 1965 found an 18.2% recidivism rate for offenders targeting the opposite sex and a 34.5% recidivism rate for same-sex offenders after 5 years.Because recidivism is defined and measured differently from study to study, one can arrive at inaccurate conclusions being made based on comparison of two or more studies that are not conducted with similar methodology.