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Review: bona fide psychotherapies are similar in effectiveness

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Question Are all bona fide psychotherapies equally effective (Dodo bird effect)?

Data sources

Journals that typically published outcome studies comparing ≥2 bona fide psychotherapies were searched: Behavior Therapy, Behaviour Research and Therapy, Journal of Consulting and Clinical Psychology, Journal of Counseling Psychology, Archives of General Psychiatry, and Cognitive Therapy and Research.

Study selection

Studies were selected if they were published in any of the 6 journals between 1970 and 1995, contained data that could be used to calculate effect sizes for the dependent measures, and compared ≥2 bona fide psychotherapies. Bona fide treatment involved a therapist with at least a master's degree who tailored a treatment based on psychological principles and the patient problem was one that would reasonably be treated by psychotherapy. Studies with treatments for controlling common or non-specific factors such as placebos, alternative therapies, or non-specific …

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