Date of Award

7-23-2010

Degree Type

Dissertation

Degree Name

Doctor of Psychology (PsyD)

Committee Chair

Michelle R. Guyton, Psy.D.

Second Advisor

Genevieve L. Y. Arnaut, Ph.D., Psy.D.

Third Advisor

Michel Hersen, Ph.D., ABPP

Abstract

The ability of the Static-99 and dimensional measurement of penile plethysmograph (PPG) to predict conviction for new general or sexual offenses was assessed with a community sample. Because deviant sexual arousal is theoretically a dynamic risk factor and treatment target, this study proposed that adding the PPGmeasured deviant arousal to the Static-99 would improve the predictive quality of the actuarial measure. Records for 131 subjects who presented for psychosexual evaluations at a community sex offender treatment facility were examined to collect relevant data and score the Static-99, and conviction information was obtained from the Oregon Department of Corrections. These data were examined using logistic regression to determine the predictive validity of the Static-99, predictive qualities of the PPG, and incremental validity of adding PPG information to the Static-99. Contrary to previous studies examining the Static-99 and PPG separately, results indicated that there were no statistically significant relationship between Static-99 scores, PPG percent deviant arousal, and any new sexual or general convictions. Similarly, the addition of the PPG results to the Static-99 offered no statistically significant increase in predictive abilities. The Static-99 and PPG results performed at chance when predicting recidivism, either generally or sexually, when examined in a community setting. In order to produce more reliable measures of recidivism with offenders released in the community, the Static-99 norms and items, as well as the interpretation and utility of PPG results, must be revisited and refined.

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