Clinical depression epidemiology and demographics

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Kiran Singh, M.D. [2]

Overview

The one-year prevalence of major depressive disorder is approximately 7,000 per 100,000 (7%) of the overall population with marked differences by age groups.

Epidemiology and Demographics

Incidence

• The annual incidence (the number of new cases) of a major depressive episode has been estimated as 1.59% (1.89% in women and 1.10% in men).

Prevalence

• The twelve-month prevalence of major depressive disorder is 7,000 per 100,000 (7%) of the overall population.

Age

• There are marked differences by age groups; for example, the prevalence of major depressive disorder in individuals aged 18-29-year-old is x3 higher than the prevalence in the individuals aged 60-year-old and more. In individuals with the onset of major depressive disorder in early adolescence, the prevalence is 1.5- to 3-fold higher in females than in males.

Gender

• Major depressive disorder is more common in women.

Sociocultrural

• Depressive disorders are more common among single and divorced individuals compared with married individuals.
• There is no association between depressive disorders and socioeconomic status or religion.

Race

• There is no racial predilection to depressive disorders.