抑郁是最常见的精神障碍之一，是全球首要致残原因，也是直接及间接医疗成本的重要来源。由于缺乏实验室或影像学检测手段，通过临床晤谈或自评量表了解症状仍是检测抑郁及监测治疗反应的主要手段。
自2001年首次发表以来，9项患者健康问卷抑郁量表（PHQ-9）在全球范围内得到广泛传播，原始文献被引超过11,000次，并被译为超过100种语言。PHQ-9成为数以百计的临床及人群研究的测评工具，被写入大量抑郁指南，并在很多临床机构得到了广泛应用。尽管目前抑郁筛查仍远谈不上普及，但只要有筛查，PHQ-9就是最重要的量表。
建议每1-2 周进行一次自我评估，答题时请选择过去两周内，有多少时间您被以下问题所困扰?
Kroenke, K., Spitzer, R. L., & Williams, J. B. (2001). The PHQ-9. Journal of General Internal Medicine, 16(9), 606-613.
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The Patient Health Questionnaire-9 (PHQ-9) is a self-administered, 9-item depression module that has demonstrated excellent reliability and validity for screening, diagnosing, monitoring, and measuring the severity of depression. It has been widely used globally in clinical practice and research settings. The original study by Kroenke, Spitzer, & Williams in 2001 has been cited over 11,000 times and has been translated into more than 100 languages. The PHQ-9 has been incorporated into numerous depression guidelines and is a key tool in depression screening and assessment.
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