Social inequality and common mental disorders

Objective: To analyze the association between the socioeconomic characteristics of individuals and common mental disorders. Method: A cross-sectional survey of a representative sample of the urban population, 14 years and older, in Campinas (Brazil) (n = 515) was conducted using a multipurpose instrument that included the Self-Reporting Questionnaire (SRQ-20) to assess common mental disorders in the previous 3 months. Weighted prevalence of common mental disorders was calculated for each independent variable. Crude and adjusted prevalence ratios were estimated using Poisson regression. Results: The overall prevalence was 17% (95% CI 12.8-22.3), 8.9% in males and 24.4% in females. An inverse association was found between common mental disorders and the socioeconomic characteristics (schooling and employment) even after controlling for all the other variables. Higher common mental disorders prevalence was observed in those with less than 5 years of schooling (PR = 5.5) and unemployed or underemployed (PR = 2.0). Conclusions: As in other studies, common mental disorders were unevenly distributed; it was significantly more frequent in socially disadvantaged individuals. Specific actions to reduce inequalities in the general and mental health system should be studied.