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Related Experiment Video

Updated: May 3, 2026

Animal Models of Depression - Chronic Despair Model CDM

Animal Models of Depression - Chronic Despair Model CDM

Published on: September 23, 2021

[Is two weeks the optimum duration criterion for major depression?].

Jules Angst¹, Michael P Hengartner¹, Vladeta Ajdacic-Gross¹

¹Department of Psychiatry, Psychotherapy and Psychosomatics Psychiatric Hospital, University of Zurich. Switzerland.

Actas Espanolas De Psiquiatria

|February 8, 2014

Summary

The 2-week criterion for major depressive episodes (MDE) may be questionable, as shorter depressive syndromes show similar validity and treatment rates. Further epidemiological studies are needed for confirmation.

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Area of Science:

Psychiatry
Clinical Psychology
Epidemiology

Context:

Diagnostic criteria for major depressive episodes (MDE) are crucial for identifying individuals requiring treatment.
The current DSM-IV criteria for MDE may not capture a significant proportion of treated patients.
Treated individuals often present with depressive episodes shorter than two weeks or with fewer symptoms than diagnostic thresholds.

Purpose:

To evaluate the clinical relevance and validity of the duration of depressive syndromes.
To examine the diagnostic utility of shorter depressive episodes compared to the standard 2-week MDE criterion.

Summary:

Depressive syndromes lasting under two weeks were found to be highly prevalent in a community sample.
Depressive syndromes of 4+ days duration demonstrated comparable validity (family history, age of onset, course) and treatment rates to those lasting 2-4 weeks.
These findings suggest that the 2-week duration criterion for MDE may not be optimal.

Impact:

Challenges the established 2-week duration criterion for major depressive episodes.
Highlights the need for revised diagnostic criteria to better identify individuals with depression who receive treatment.
Underscores the importance of considering shorter depressive episodes in clinical practice and future research.