= Patient Health Questionnaire-9
{c}
= PHQ-9
{c}
{synonym}
A nine-item <depression> <symptom> questionnaire. A score, a change score, a <Clinical caseness>[caseness] threshold and a <clinical diagnosis> are distinct uses or interpretations.<Feedback-informed treatment versus usual psychological treatment for depression and anxiety: a multisite, open-label, cluster randomised controlled trial by Jaime Delgadillo and others>[Lancet Psychiatry 5, 564–572; 77 participating therapists, 2233 patients, cluster allocation and not-on-track outcomes]{ref}
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