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Predictive Validity of the Static-99 and Static-2002 for Sex Offenders on Community Supervision

Author(s): Leslie M. D. Helmus | R. Karl Hanson

Journal: Sexual Offender Treatment
ISSN 1862-2941

Volume: 2;
Issue: 2;
Start page: 3;
Date: 2007;
Original page

Keywords: Static-99 | Static-2002 | recidivism | risk assessment | sexual offenders

The Static-99 is the most commonly used actuarial tool for sexual offenders. Although it has shown acceptable predictive accuracy in a large number of studies, all these studies involved researchers scoring the instrument retrospectively. Consequently, it is unclear whether similar results would be obtained when used in routine practice. The authors of the Static-99 have proposed a new scale, the Static-2002, but there has been insufficient research to determine whether it is an improvement over the Static-99. This study examined the predictive accuracy of the Static-99 in a prospective study of 706 Canadian sexual offenders on community supervision. All assessments were conducted by the probation and parole officers responsible for supervising the cases. The Static-99 was compared with the Static-2002, which was scored retrospectively from criminal history records. After an average 3 year follow-up, the Static-99 and Static-2002 were equally accurate in predicting sexual recidivism (ROC of .76 for both). The Static-2002, however, was better than the Static-99 at predicting violent and general recidivism. There were no significant differences in the accuracy of the measures for rapists, child molesters, or non-contact offenders. Overall, the Static-99 and Static-2002 are both reliable and valid measures of recidivism risk for sexual offenders.
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