Depression Test (CES-D)

What Is Depression?

Major Depressive Disorder (MDD) is a common mental health condition characterized by persistent sad mood and loss of interest or pleasure in activities (anhedonia), accompanied by physiological and cognitive symptoms. Depression differs from everyday sadness — it is persistent, intrusive, and affects work, study, and relationships.

About the CES-D

The Center for Epidemiologic Studies Depression Scale (CES-D) came out of Radloff's work at the U.S. National Institute of Mental Health (NIMH) in 1977. It was designed as a screening tool for the general population, not a clinical diagnostic instrument — that distinction matters. Its 20 items cover six core symptom clusters: depressed mood, positive affect, somatic symptoms, interpersonal difficulties, psychomotor retardation, and sleep disturbance.

Psychometric Properties:

• Internal consistency: α = 0.85-0.90 (general population), α = 0.90 (patient samples)
• Test-retest reliability: r = 0.51-0.67 (2-8 week intervals)
• Good discriminant validity against clinical diagnoses

Scoring

Each item rates symptom frequency over the past week:

• 0 = Rarely or none of the time (<1 day)
• 1 = Some or a little of the time (1-2 days)
• 2 = Occasionally or a moderate amount of time (3-4 days)
• 3 = Most or all of the time (5-7 days)

Higher scores indicate more depressive symptoms.

CES-D vs. PHQ-9 vs. BDI-II

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Scale	Population	Items	Time Frame	Primary Use
CES-D	General population	20	Past week	Epidemiological screening, community research
PHQ-9	Clinical/general	9	Past 2 weeks	Depression severity (DSM-5 aligned)
BDI-II	Clinical patients	21	Past 2 weeks	Clinical depression assessment (multi-domain)

CES-D is best suited for early screening in the general population and epidemiological research, while PHQ-9 and BDI-II are more appropriate for clinical diagnostic support.

Important Note

This is a screening tool, not a diagnostic instrument. If you have a high score or concerns about your mental health, please consult a qualified mental health professional.