FIGURE 27–1. Estimated effect size (r) and 95% confidence intervals.



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FIGURE 27–1. Estimated effect size (r) and 95% confidence intervals.Weighted average effect sizes and 95% confidence intervals for subsets of studies as a function of the moderator variables: target, control condition, duration, daily earnings, voucher-based reinforcement therapy (VBRT) delivery immediacy, setting, and study quality. All studies target abstinence (N = 30). Weighted average effect sizes are represented by closed diamonds and 95% confidence intervals by solid lines. Where confidence intervals do not overlap, differences between subsets of studies are significantly different at the 0.05 level.Source. Reprinted from Lussier JP, Heil SH, Mongeon JA, et al: "A Meta-Analysis of Voucher-Based Reinforcement Therapy for Substance Use Disorders." Addiction 101:192–203, 2006. Used with permission.


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