Tuesday, 17 May 2022

Patient Health Questionnaire-9 (PHQ-9)

Patient Health Questionnaire-9 (PHQ-9)

Kroenke, Spitzer, & Williams, 2001

The PHQ-9 is a 9-item self-report measure assessing depressive symptoms in adults.  The PHQ-9 can be used as a screening tool a diagnostic tool, and to monitor symptom changes over time. There exists a separate version of the PHQ-9 for adolescents within the Patient Health Questionnaire-Adolescent Version (PHQ-A; Johnson et al., 2002). Sample items include, “Little interest or pleasure in doing things” and “Feeling down, depressed, or hopeless.” Each item is rated on a scale from zero (“not at all”) to three (“nearly every day”). Total scores range from 0-27. Meta-analysis of the PHQ-9 diagnostic accuracy compared to independent mental health professional diagnosis demonstrates good criterion validity with a sensitivity of 77% and a specificity of 94%.  

The PHQ is also validated as an 8- and 2-item measure to assess depression severity.

The measures are available online

(Stable Resource Toolkit, SAMHSA, 1999)

(PHQ-9; http://www.phqscreeners.com/

and PHQ-9A;


(PHQ Screeners-Instruction Manual, 2010), (Kroenke, Spitzer, & Williams, 2003). (Kroenke et al., 2001).

(Löwe, Unützer, Callahan, Perkins, & Kroenke, 2004).

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