This study determined that there were some improvements in quality of care for individuals with major depressive disorder as a result of mental health parity in the Federal Employee Health Benefits Program; however, the authors highlight the limits of parity.  The authors conclude that efforts over and above parity legislation are required to greatly improve quality of depression care.  

Busch, A. B., Huskamp, H. A., Normand, S. L., Young, A. S., Goldman, H., & Frank, R. G. (2006). The impact of parity on major depression treatment quality in the Federal Employees' Health Benefits Program after parity implementation. Medical Care, 44(6), 506-12. http://www.ncbi.nlm.nih.gov/pubmed/16707998

Authors: Alisa B. Busch, Haiden A. Huskamp, Sharon-Lise T. Normand, Alexander S. Young, Howard Goldman, Richard G. Frank