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Incremental Validity of the Static-99 and the Personality Assessment Inventory for Predicting Sexual Recidivism Among Adult Male Sex Offenders

25 July 2008


The Static-99 is an established risk assessment instrument designed for use with adult male sex offenders. This instrument demonstrates significant utility, but because of the importance of making accurate decisions regarding the dangerousness of sex offenders, improving the accuracy of the instrument is critical. The current study examined whether the addition of data from the Antisocial Features and Aggression scales of the Personality Assessment Inventory (PAl) would improve the predictive power of the Static-99 in a sample of 72 adult male sex offenders evaluated at a community clinic. Neither the Static-99 nor any of the modifications incorporating the PAl scales significantly predicted sexual rearrest or sexual reconviction during the follow-up period, which averaged 5.2 years. Implications of these findings are discussed in the context of the sample characteristics.


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