Cross-validation and extension of the violence risk appraisal guide for child molesters and rapists.

A cross-validation of the Violence Risk Appraisal Guide was performed on a sample of 159 child molesters and rapists followed for an average of 10 years at risk. The performance of the instrument was also examined on a 10-yr followup of 288 sex offenders that included both those in the original construction sample for the VRAG and the validation sample. The instrument performed as well as it had in construction for predicting violent recidivism in both the cross-validation and extended followup samples, and moderately well in the prediction of sexual recidivism. Survival analyses showed that child molesters exhibited higher risk of sexual recidivism than rapists or offenders against both children and adults, whereas the opposite was true for violent recidivism. As predicted, psychopathy and phallometrically determined sexual deviance exhibited a multiplicative interaction effect on sexual recidivism. Proportional hazards event history analyses supported the use of the VRAG for the prediction of violent recidivism among sex offenders.