Patient Health Questionnaire-9.
PHQ-9
Depression severity mapped 1:1 to the nine DSM-IV/DSM-5 MDD criteria (past 2 weeks); doubles as screener and severity monitor
- Provisionally grouped under
- Length and format
- 9 (+1 functional-impairment item, unscored). 4-point frequency (0-3, not at all to nearly every day), summed 0-27 (self-report questionnaire)
- Language versions
- 80+ languages worldwide (Kroenke 2021 World Psychiatry documents global uptake); validated across most major languages
- Reference
- Kroenke, K., Spitzer, R. L., & Williams, J. B. W. (2001). The PHQ-9: validity of a brief depression severity measure. Journal of General Internal Medicine, 16(9), 606-613.
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