Meta-analyses by Smith and Glass 1980)and Weisz et al.1987)of the efficacy of psychotherapies for adult and child problems have found that the average person receiving therapy is better off than approximately ____ of people with similar problems who did not receive therapy.

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Both meta-analyses found that the average person receiving therapy is better off than approximately 80% of people with similar problems who did not receive therapy.

Meta-Analyses by Smith and Glass 1980)and Weisz Et Al