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The Zung Self-Rating Depression Scale is a 20-item self-report questionnaire that is widely used as a screening tool, covering affective, psychological and somatic symptoms associated with depression. This 20-Question self-rating depression evaluation helps you assess your risk of depression. Each answers is scored from 1 to 4 and the highest possible score is 80. Most people with depression score above 50. 

The questionnaire takes about 10 minutes to complete, and items are framed in terms of positive and negative statements. It can be effectively used in a variety of settings, including primary care, psychiatric, drug trials and various research situations. Each item is scored on a Likert scale ranging from 1 to 4. A total score is derived by summing the individual item scores, and ranges from 20 to 80. Most people with depression score between 50 and 69, while a score of 70 and above indicates severe depression. The scores provide indicative ranges for depression severity that can be useful for clinical and research purposes, but the Zung scale cannot take the place of a comprehensive clinical interview for confirming a diagnosis of depression. The Zung scale also provides a simple tool for monitoring changes in depression severity over time in research studies.

Source: Zhun, A self-rating depression scale. Arch Psychiatry 1965:63-70


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