This study used meta-analysis to compare analyze data regarding the effects of music therapy on children and adolescent. The study examined 96 ESs using means and standard deviations from 77 Korean degree dissertations conducted between2000 and 2010.Results were as follows: The overall effect size (ES) of the therapy program was found to be 0.14, which, according to Cohen's ES interpretation criteria, is small. The mean ES was influenced by the subjects (children/ adolescents), ES of children(0.50) was bigger than ES of adolescents(-0.23). When results were sorted by the variables of therapy part: social, emotional and behavior development), the ES of social development was the biggest (1.11), followed by behavior development (-1.07) and emotional development (-0.01). However, other variables (total number of procedures, number of treatments per week, the average treatment time, therapist characteristics) made no statistically significant differences to the efficacy of the therapy. Finally, limitations of this study and potential future research are discussed.

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