ADVANTAGES

Table 4 presents the ROC values for the Static-99 and Static-2002 across offender subgroups of rapists, child molesters, and non-contact sex offenders. Across all three outcomes, both the Static-99 and Static-2002 showed moderate to large effect sizes with child molesters, rapists, and non-contact offenders. All effect sizes were significant except for the Static-2002’s prediction of violent and any recidivism for non-contact offenders. For both the Static-99 and the Static-2002, there were no significant differences in predictive accuracy across the three offender subgroups. When comparing the predictive accuracy of the two measures within subgroups, four significant differences emerged. The Static-2002 showed greater predictive accuracy than the Static-99 in the prediction of violent recidivism for rapists, violent recidivism for child molesters, any recidivism for rapists, and any recidivism for child molesters. However, when Bonferroni’s correction for multiple comparisons was applied, the only finding that remained significant was that the Static-2002 predicted any recidivism in child molesters with greater accuracy than the Static-99 (difference = .056, 99.4% C.I. of .002 to .110).

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