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Zung Self-Rating Depression Scale (SDS) Test

Understand risk for depressive symptoms in about 3 minutes. This 20 item screen spots mild to severe concerns fast and supports clearer follow up.
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Questions: 203 minutes
Hi! My name is Freudly, i am an AI therapist, I will give you an interpretation of the test after you complete it.
08:30
October 2, 2025
October 2, 2025
Material has been updated
15904 views
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Scale Explorer
How the Scales are Structured
example score
63/100
Depression Index (DI)
Measures the severity of depressive symptoms as an index score standardized for comparison with reference ranges.
No depression
Mild depression
Subdepressive to severe
25 – 49: No depression | 50 – 59: Mild depression | 60 – 100: Subdepressive to severe
A score of 63 falls in the subdepressive to severe range, indicating elevated depressive symptoms compared with typical levels.
example score
52/80
Raw Score (RS)
The raw score summarizes the overall severity of self-reported depressive symptoms on the Zung SDS.
No depression
Mild depression
Moderate to severe
20 – 49: No depression | 50 – 59: Mild depression | 60 – 80: Moderate to severe
A raw score of 52 falls in the mild depression range, suggesting a mild level of depressive symptom severity on this screening scale.
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DATA-BASED USER COHORTS
Who Usually Takes This Test?
Feeling persistently low
41%OF USERS
People who notice sadness, emptiness, irritability, or loss of interest and want a quick check of how severe it may be.
Stressed and burned out
34%OF USERS
Those under chronic stress from work, study, or caregiving who are unsure whether fatigue and sleep issues point to depression.
Starting mental health care
25%OF USERS
People preparing for a first visit with a specialist or monitoring early treatment who want a simple baseline measure of mood symptoms.
BASED ON AGGREGATED, ANONYMIZED DATA FROM TENS OF THOUSANDS OF FREUDLY USERS.
RESULTS YOU CAN ACTUALLY USE
What You’ll See After You Finish the Test
Scale Results
— Explained Clearly
Your scores across each test scale, translated into plain, usable insights. Not just numbers, but what they actually mean for your daily life, emotional state, and overall well-being.
AI-Powered
Interpretation
A structured, clinically grounded explanation. Our AI analyzes patterns and relationships between scales to provide a coherent interpretation — without alarmist language.
Statistical
Comparison
See how you compare to others. Your scores are placed in a statistical context, showing percentiles and trends based on anonymized platform data to help you understand what`s typical.
Practical
Recommendations
Actionable guidance tailored to your profile. Receive clear, realistic suggestions you can apply immediately — focused on coping, self-regulation, and realistic next steps.
AI-Detected
Insights
Key patterns you might not notice on your own. Surfacing subtle connections in your responses that help you better understand what may be driving your current results.
Discuss with
an AI Psychologist
Clarify, reflect, and explore right away. Talk through your outcomes, ask questions, and explore meanings in a calm, non-diagnostic dialogue environment.
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Used in 52+ countries
Benchmarking
See How You Compare
Once you finish the test, your results will be compared with real-world data from people in your country.
Below is a preview of the benchmarks we use to place your score in context.
Depression Index (DI)
Average
80
Normal range
68.7 — 91.4
min.
25
max.
100
majority
This curve shows how scores are typically distributed.
Once you complete the test, your result will appear here so you can see where you land.
Raw score (Rs)
Average
43.4
Normal range
32.7 — 54.1
min.
20
max.
80
majority
This curve shows how scores are typically distributed.
Once you complete the test, your result will appear here so you can see where you land.
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CLEAR ANSWERS TO COMMON QUESTIONS
Frequently Asked Questions

Any questions left?

What does this questionnaire measure?
It screens for the presence and severity of depressive symptoms. It covers mood, energy, anxiety-related features, and physical complaints commonly linked to depression.
How long does it take and how many items are included?
It includes 20 items and typically takes about 3 minutes to complete.
How should responses be selected?
Select the option that best matches how symptoms have been experienced recently. Answer all items using the first response that seems accurate.
Can results be used to diagnose depression?
Results indicate symptom level and whether further evaluation may be needed. A clinical diagnosis requires a qualified professional assessment.
How are scores interpreted and used?
Higher scores indicate more frequent or more severe symptoms. Results are commonly used for screening, baseline measurement, and monitoring change over time.
WHAT THE TEST MEASURES
About This Assessment

Zung Self-Rating Depression Scale (SDS) Test

depression

This self-report measure is designed to screen for current depressive symptom burden using brief, structured ratings. The Zung Self-Rating Depression Scale (SDS) asks respondents to rate the frequency of common affective, cognitive, and somatic symptoms.

It includes 20 items and typically takes about 3 minutes to complete. Results are generally interpreted as an index of symptom severity and are commonly used for initial screening and to support clinical follow-up rather than as a stand-alone diagnosis.

The Zung Self-Rating Depression Scale (SDS) may be useful in clinical and research contexts for monitoring symptom change over time and identifying individuals who may benefit from more comprehensive assessment.

Author: william-w-k-zung
Literature: Beck, A. T., Rush, A. J., Shaw, B. F., & Emery, G. Cognitive therapy of depression. Guilford Press. 1979.; American Psychiatric Association. Diagnostic and statistical manual of mental disorders (4th ed.). American Psychiatric Association. 1994.; Zung, W. W. K. A self-rating depression scale. Archives of General Psychiatry. 1965.; Dunstan, D. A., & Scott, N. Clarification of the cut-off score for Zung’s self-rating depression scale. BMC Psychiatry. 2019.
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