Citation: Westen, D., & Morrison, K. (2001). A multidimensional meta-analysis of treatments for depression, panic, and generalized anxiety disorder: an empirical examination of the status of empirically supported therapies. Journal of Consulting and Clinical Psychology, 69(6), 875-899.

This meta-analysis draws a distinction between initial response and sustained efficacy and attempts to determine the sustained efficacy of evidence-based treatments. This is particularly useful in their examination of GAD, for which a sizable percentage of clients experience significant improvements even before seeing a therapist for the first time. The analysis included five controlled studies of GAD which generally excluded comorbid conditions and had high completion rates.

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