Total number of questions
9
Administration method
Self-Report
Standardized cadence
Every 2 weeks
Age range
18+
Language
English and Spanish
Scoring and interpretation
Reliability and validity
PHQ-9 scores > 10 had a sensitivity of 88% and a specificity of 88% for Major Depressive Disorder. A study involving two different patient populations produced Cronbach alphas of .86 and .89.
Additional information
Different versions of the PHQ-9 are available, including a version for adolescents (PHQ-A), a version omitting suicide-related questions (PHQ-8), and a version translated to Spanish (PHQ-9 Spanish).
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