2 52 CHAPTER 2 sex offenders for each of the three recidivism types. Effect sizes of individual samples are presented in Appendix B2 in the online supplemental materials. 2.4.2.1 Incremental validity for sexual recidivism The fixed-effect weighted hazard ratio on sexual recidivism was 1.08, 95% CI [1.06, 1.10], N = 3,747, based on 13 unique samples. The Q indicated that the variability across studies was not significant (Q = 18.3, p = .11). The I2 (34.3%) indicated that the variability in effect sizes among studies that could not be explained by chance was moderate. 2.4.2.1.1 Moderators None of the categorical moderators was found to be significant in the Qbetween analysis. This also applied to the fixed-effect meta-regression of the continuous moderators; year of publication (b1 = -.00934, SE = .00514, Z = -1.815, p = .070, k = 13), sample size (b1 = -.00004, SE = .00006, Z = -0.676, p = .499, k = 13), and follow-up time (b1 = -.00006, SE = .00020, Z = -0.285, p = .776, k = 13). Detailed information on the categorical moderator analysis is provided in Appendix C4 (available in the online supplemental materials). 2.4.2.2 Incremental validity for violent (including sexual) recidivism The fixed-effect weighted hazard ratio on violent (including sexual) recidivism was 1.06, 95% CI [1.04, 1.08], N = 9,019, based on 11 unique samples. The Q indicated that the variability across studies was not significant (Q = 11.8, p = .30). The I2 (15.0%) indicated that there was low variability among studies. 2.4.2.2.1 Moderators None of the categorical moderators in the Qbetween analysis and none of the continuous moderators in the fixed-effect meta-regression were significant; year of publication (b1 = .00896, SE = .00105, Z = -0.858, p = .391, k = 11), sample size (b1 = .00002, SE = .00002, Z = 1.483, p = .138, k = 11), and follow-up time (b1 = -.00019, SE = .00016, Z = -1.190, p = .234, k = 11). Details on the categorical moderator analysis are presented in Appendix C5 (available in the online supplemental materials). 2.4.2.3 Incremental validity for any recidivism The random-effect weighted hazard ratio on any recidivism was 1.05, 95% CI [1.02, 1.08], N = 2,511, based on 8 unique samples. There was significant variability among study effect sizes (Q = 16.3, p = .02; I2 = 57.1%). 2.4.2.3.1 Moderators The Qbetween analyses for the fixed-effect model revealed no significant effects for
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