Smith and Glass's (1977)initial meta-analysis of the effect of psychotherapy suggested that

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Smith and Glass's (1977) initial meta-analysis concluded that psychotherapy can have a substantially positive impact, on average. The study found that, compared to control groups or no treatment, psychotherapy clients typically showed better outcomes in terms of symptom reduction, improved functioning, and increased well-being.

Smith and Glass's (1977)initial Meta-Analysis of the Effect of Psychotherapy