Table 1: Characteristics of Included Studies. Of the two studies identified as outliers Helmus et al. Another unique feature of the Risk Matrix is that it contains three separate lanett alabama sex offenders in Chichester scales designed to capture different dimensions of recidivism risk.
Given the differences lanett alabama sex offenders in Chichester base rates, it may be desirable for researchers to focus on standardized follow-up periods of 5 and 10 years for sexual recidivism, and 2 and 5 years for non-sexual violence and any violent recidivism.
Each study was coded separately by the first two authors, who then developed a consensus rating.
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The average follow-up period for a study was 7. Method Sample To be included, studies had to include a sample of sex offenders, ratings on the Risk Matrix either the Sexual, Violent, or Combined scales , and a follow-up period assessing either sexual, non-sexually violent, violent, non-violent, or any recidivism.
The study from Barnett, Wakeling, and Howard contained a large sample of treated offenders from the United Kingdom with effect sizes for sexual, non-sexually violent, and violent recidivism. In this analysis, the overall variability among studies measured by the Q statistic can be partitioned into the variability within each level of the moderator and the variability between levels of the moderator Q between.
Based on their scores, offenders are placed in one of the following four risk categories:. The sample size of one study Barnett et al.