Patient Health Questionnaire-9
ID: patient-health-questionnaire-9
A nine-item depression symptom questionnaire. A score, a change score, a caseness threshold and a clinical diagnosis are distinct uses or interpretations.[ref]
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
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