A brief measure for assessing the severity of depressive symptoms over the past two weeks.
Publisher: Developed by Drs. Kroenke, Spitzer, and Williams with an unrestricted educational grant from Pfizer Inc.
Citation: Kroenke, K., Spitzer, R.L., & Williams, J.B. (2001). The PHQ-9: Validity of a brief depression severity measure. Journal of General Internal Medicine, 16(9), 606-613.