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Patient Health Questionnaire-9/Evidence
Method evidence record

Patient Health Questionnaire-9

The PHQ-9 is a brief, nine-item self-report questionnaire developed by Kroenke, Spitzer, and Williams to screen for and measure the severity of depressive symptoms. Published in 2001 in the Journal of General Internal Medicine, it has become one of the most widely used depression screening instruments globally. The scale maps directly to DSM-IV diagnostic criteria for major depressive disorder, making it valuable in both clinical and research settings.

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Source record

Citations copied verbatim from the method’s source record. No claim-level verification is inferred from them.

Patient Health Questionnaire-9: Depression Scale
Taxonomic method record · process-pipeline / clinical-psychology
  • 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. · DOI 10.1046/j.1525-1497.2001.016009606.x
  • Kroenke, K., Spitzer, R. L., Williams, J. B., & Löwe, B. (2010). The Patient Health Questionnaire Somatic, Anxiety, and Depressive Symptom Scales: a systematic review. General Hospital Psychiatry, 32(4), 345–359. · DOI 10.1016/j.genhosppsych.2010.03.006
  • Manea, L., Gilbody, S., & McMillan, D. (2012). Optimal cut-off score for diagnosing depression with the Patient Health Questionnaire (PHQ-9): a meta-analysis. CMAJ, 184(15), E682–E689. · DOI 10.1503/cmaj.110829
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Curated claims

Claims persisted in the evidence ledger, each with its own assessment.

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Related methods

Generated from the method graph and shown as machine-suggested relations — no evidence claim is inferred.

Same method familyBeck Depression Inventory-IImachine-suggested · Relational suggestion, not evidence.Same method familyHamilton Depression Rating Scalemachine-suggested · Relational suggestion, not evidence.Same method familyMontgomery-Åsberg Depression Rating Scalemachine-suggested · Relational suggestion, not evidence.Same method familyPatient Global Impression of Changemachine-suggested · Relational suggestion, not evidence.Same method familyQuick Inventory of Depressive Symptomatologymachine-suggested · Relational suggestion, not evidence.

Evidence status

Sources recorded, not reviewed

Bibliographic sources are present. Claim-level evidence review has not been performed.

Sources

3 recorded citations, copied from the method source record.

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