The Patient Health Questionnaire (PHQ) is a widely used self-report instrument for screening, diagnosing, monitoring, and measuring the severity of depression. It is brief, validated, and frequently used in both clinical and research settings for identifying depressive symptoms.
[Reference: Helwig, A. A. (2020). CPCE Study Guide and Review; Kroenke, K., Spitzer, R. L., & Williams, J. B. (2001). "The PHQ-9: Validity of a brief depression severity measure." Journal of General Internal Medicine.]
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