Zung Self-Rating Depression Scale (SDS) Test
Understand your level of depressive symptoms in about 15 minutes. A 20 item scale built for screening, tracking change over time, and supporting clinical research and early evaluation.
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08:30
Scale Explorer
How the Scales are Structured
DATA-BASED USER COHORTS
Who Usually Takes This Test?
BASED ON AGGREGATED, ANONYMIZED DATA FROM TENS OF THOUSANDS OF FREUDLY USERS.
RESULTS YOU CAN ACTUALLY USE
Benchmarking
See How You Compare
Once you complete the test, your results are compared with real-world data from people in your country.
Below is a preview of how scores are typically distributed across each scale.
Below is a preview of how scores are typically distributed across each scale.
Depression Level (DL)
Average
41.6
Normal range
33.9 — 49.3
min.
20
max.
80
Majority
This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.
Once you complete the test, your result will appear on the scale so you can see how you compare.
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CLEAR ANSWERS TO COMMON QUESTIONS
Frequently Asked Questions
What does this questionnaire measure?
It screens the severity of depressive symptoms based on self-reported experiences. It supports differential evaluation of depressive states and related low-mood conditions.
How many items are included and how long does it take?
It contains 20 statements. Typical completion time is about 15 minutes.
What time period should responses reflect?
Responses should reflect recent symptoms and functioning over the past several days to two weeks. Use the same time frame for all items.
How should the items be answered?
Select one response per statement that best matches symptom frequency or intensity. Answer every item without leaving blanks.
How are results used and what are the limits of interpretation?
Scores are used for screening, monitoring symptom change over time, and research purposes, including clinical studies and medication trials. Results do not confirm a diagnosis and should be interpreted alongside a clinical evaluation.
WHAT THE TEST MEASURES
About This Assessment
Zung Self-Rating Depression Scale (SDS) Test - Symptoms and Signs
This self-report instrument is used to quantify the severity of depressive symptoms, with attention to core affective, cognitive, and somatic features. The Zung Self-Rating Depression Scale (SDS) was developed by William W. K. Zung and is commonly used in clinical and research contexts as a brief screening measure and for monitoring symptom change over time.
The measure consists of 20 items and typically requires about 15 minutes to complete. Scores from the Zung Self-Rating Depression Scale (SDS) are interpreted as an index of depressive symptom burden and should be considered alongside clinical interview findings, relevant history, and other assessment data rather than used as a stand-alone diagnostic determination.
Author: William W. K. Zung
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