Transdiagnostic approaches to the treatment of anxiety disorders: A quantitative review.

Transdiagnostic cognitive-behavioral group treatments for anxiety, treatments that are designed to be applicable to diagnostically mixed groups of anxiety disorder clients, have been garnering interest in recent years. At least 7 independent research teams have developed transdiagnostic anxiety treatment protocols and reported preliminary outcomes data. In this review, we outline the basic theoretical rationale underlying transdiagnostic models of anxiety and review each of the treatment protocols that have been reported to date. Finally, the efficacy of these treatments is examined using meta-analytic methods. Results indicated that overall, transdiagnostic treatments are associated with a very large pre- to posttreatment effect size, and stable maintenance of gains through follow-up. Recommendations for transdiagnostic treatment implementation are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved).