The Zung Self-Rating Depression Scale (SDS) is a short and comprehensive clinical instrument to measure depression severity. It was developed in 1965 by William W. K. Zung (1929–1992), a psychiatrist at Duke University who studied mood and anxiety disorders. The SDS has been used widely in clinical psychology and psychiatry and has been translated into more than 30 languages. The original article in which Zung introduced the SDS has been cited more than 8,000 times, stressing the popularity of the SDS as a clinical tool.

The SDS is a self-reporting instrument that can be completed in about 8 to 10 minutes. It has been used primarily to monitor treatment in patients who are depressed, but it is also used to screen for depression in general practice. ...

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