The purpose of the present study was to assess the effectiveness of cognitive behavioral therapy for pathological gambling in reducing gambling behavior, gambling money, and pathological gambling symptoms. Data sources were electronic databases (PsycINFO, MEDLINE, PubMed, CiNii, and ICHUSHI), and the reference lists of the studies included in the meta-analysis and relevant reviews up to July 2012. Of the 213 studies reviewed for eligibility, quality of study, and data extraction, 4 studies were included in the final analysis. The meta-analysis included 7 clinical trials which revealed that cognitive behavioral therapy was effective for reducing gambling behavior (at post-treatment: Hedges' g=0.49, 95% confidence interval=0.24 to 0.74; at 6-month after treatment: Hedges' g=0.40, 95% confidence interval=0.21 to 0.59) and gambling money (at post-treatment: Hedges' g=0.59, 95% confidence interval=0.17 to 1.00; at 6-month after treatment: Hedges' g=0.51, 95% confidence interval=0.14 to 0.89), and pathological gambling symptoms (at post-treatment: Hedges' g=0.44, 95% confidence interval=0.10 to 0.78). However, the results from the measurement of heterogeneity and publication bias indicated that future research on cognitive behavioral therapy for pathological gambling with large sample sizes is needed.
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