I am doing a meta-analysis on the effectiveness of sex offender registration laws with juvenile sex offenders. I want to find out if the laws would reduce recidivism rates. I narrowed down to four studies (Yes, the body of research addressing this topic has remained extremely low). Three studies report cell-counts, so I can calculate ORs from them. However, there is one study that conducts a survival analysis and reports hazard ratios. I should also mention that the proportion of participants who re-offended is very low (
If the three studies referred to in Letourneau are not case referent studies (as Zevitz isn't) . you could estimate incidence rate ratios in them and equate these to the hazard ratio in Letourneau, eliminating consideration of OR approximation.
Otherwise just do a descriptive comparison of the 4 studies.
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