Severity Measure for Depression—Adult (Patient Health Questionnaire [PHQ‑9])
1. Introduction Disorder‑specific severity measures are standardized tools used to assess the intensity of symptoms for particular mental health conditions. They provide quantitative data that supports diagnosis, treatment planning, monitoring progress, and evaluating outcomes. For adults, one of the most widely used tools for depression is the Patient Health Questionnaire‑9 (PHQ‑9). The PHQ‑9 is both […]