The Patient Health Questionnaire-9 (PHQ-9) is a rapid psychological screening tool designed to measure symptoms of depression in primary care settings. It contains 9 questions that help identify patients with clinically significant symptoms of depression.The Patient Health Questionnaire-9 is a reliable and effective psychological screening tool for depression, the normative data of the questionnaire are based on large patient samples. [Kroenke, Spitzer, Williams, 2001]It should be remembered that this questionnaire is an auxiliary tool for a professional doctor, and does not make an accurate diagnosis. Seek qualified medical assistance from specialists.
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