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Objective: Stimulated by findings that continuous feedback on client progress improves therapy outcomes (Lambert, Whipple, however, the feedback condition had a greater effect size (0.85 vs. 0.64), suggesting that with a larger sample statistical significance may have been attained. Between the two conditions there was not a significant difference found in participants classified as reliably changed, unchanged, or deteriorated. However, when the clients were divided into groups on the basis of their presenting issue, the clients with anxiety whose therapists used feedback had significantly better outcomes at the end of therapy than the clients whose therapists did not receive the feedback. Conclusion: Contrary to previous studies, the feedback on the client's progression provided to the therapist had only a small effect on improving therapy outcome. The feedback, however, improved outcomes of the clients presenting with anxiety.
Murphy et al. (Tue,) studied this question.