The Zung Self-Rating Depression Scale (SDS) was designed by Duke University psychiatrist William W.K. Zung MD (1929-1992) to assess the level of depression for patients diagnosed with depressive disorder.
- 20-44: Normal Range.
- 45-59: Mildly Depressed.
- 60-69: Moderately Depressed.
- 70 and above Severely Depressed.
The SDS has been translated into many languages, including Arabic, Azerbaijani, Dutch, German, Portuguese, and Spanish.
You can find an online version of the SDS here.
Refer to Zung Self-Rating Anxiety Scale.
Zung, W.A.K. (1965) A Self-Rating Depression Scale. Archives of General Psychiatry. 12(1), pp63-70.