Hanson, et al. (2009) examined whether the principles associated with effective treatments for general offenders (Risk-Need-Responsivity: RNR) also applied to sexual offender treatment. Based on a analysis of 23 recidivism outcome studies meeting basic criteria for study quality, the unweighted sexual and general recidivism rates for the treated sexual offenders were lower than the rates observed for the comparison groups. What type of study was used

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The study conducted by Hanson, et al. (2009) utilized a meta-analysis approach, which involved analyzing and synthesizing data from multiple studies to draw conclusions about a particular research question or hypothesis.

Hanson, Et Al