Patient Health Questionnaire - 9 Item

**Semantic type:** Intellectual Product

**Definition:** A 9-item scale using each of the 9 DSM-IV criteria with self-reported frequency of "0" (not at all) to "3" (nearly every day). One of the most widely used instruments to assess depression, PHQ-9 scores of 5, 10, 15, and 20 represent mild, moderate, moderately severe, and severe depression, respectively.

**Synonyms:** - PHQ-9 - PHQ-9 - PHQ01 - Patient Health Questionnaire (PHQ-9) - Patient Health Questionnaire-9