RESUMEN
To study the prevalence and demographic characteristics of mood disorders among Iranian adults. In this cross-sectional population-based epidemiological study [age 18] in Iran, 25180 individuals were selected through a randomized cluster sampling method for a diagnosis using the Schedule for Affective Disorders and Schizophrenia [SADS]. They were then interviewed at home by 250 trained clinical psychologists. The estimated lifetime prevalence of Major Depressive Disorder [MOD] and Minor Depressive Disorder [mDD] were 3.1% and 0.3% respectively. Also, the estimated lifetime prevalence of Bipolar Mood disorder [BMD] type I and type II were 0.1% and 0.7% respectively. The current prevalence of MDD, mDD, BMD-I and BMD-II were 1.8%. 0.2%, 0.04%, and 0.3% respectively. Mood disorders were associated with female gender, lower education, being married, being middle-aged, living in cities, and not being a homemaker. The prevalence of mood disorders was lower among Iranian adults than reported in Western studies, and a number of demographic associations differed from those reported in Western studies: Important cultural differences in the nature or manifestation of depression are implied by these results