The impact of epidemic violence on the prevalence of psychiatric disorders in Sao Paulo and Rio de Janeiro, Brazil

PLoS One. 2013 May 8;8(5):e63545. doi: 10.1371/journal.pone.0063545. Print 2013.

Abstract

Background: Violence and other traumatic events, as well as psychiatric disorders are frequent in developing countries, but there are few population studies to show the actual impact of traumatic events in the psychiatric morbidity in low and middle-income countries (LMIC).

Aims: To study the relationship between traumatic events and prevalence of mental disorders in São Paulo and Rio de Janeiro, Brazil.

Methods: Cross-sectional survey carried out in 2007-2008 with a probabilistic representative sample of 15- to 75-year-old residents in Sao Paulo and Rio de Janeiro, Brazil, using the Composite International Diagnostic Interview.

Results: The sample comprised 3744 interviews. Nearly 90% of participants faced lifetime traumatic events. Lifetime prevalence of any disorders was 44% in Sao Paulo and 42.1% in Rio de Janeiro. One-year estimates were 32.5% and 31.2%. One-year prevalence of traumatic events was higher in Rio de Janeiro than Sao Paulo (35.1 vs. 21.7; p<0.001). Participants from Rio de Janeiro were less likely to have alcohol dependence (OR = 0.55; p = 0.027), depression (OR = 0.6; p = 0.006) generalized anxiety (OR = 0.59; p = 0.021) and post-traumatic stress disorder (OR = 0.62; p = 0.027). Traumatic events correlated with all diagnoses--e.g. assaultive violence with alcohol dependence (OR = 5.7; p<0.001) and with depression (OR = 1.7; p = 0.001).

Conclusion: Our findings show that psychiatric disorders and traumatic events, especially violence, are extremely common in Sao Paulo and Rio de Janeiro, supporting the idea that neuropsychiatric disorders and external causes have become a major public health priority, as they are amongst the leading causes of burden of disease in low and middle-income countries. The comparison between the two cities regarding patterns of violence and psychiatric morbidity suggests that environmental factors may buffer the negative impacts of traumatic events. Identifying such factors might guide the implementation of interventions to improve mental health and quality of life in LMIC urban centers.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Brazil / epidemiology
  • Cross-Sectional Studies
  • Humans
  • Logistic Models
  • Mental Disorders / epidemiology*
  • Mental Disorders / etiology*
  • Odds Ratio
  • Prevalence
  • Urban Population / statistics & numerical data*
  • Violence / psychology*

Grants and funding

This study was supported by the State of São Paulo Research Foundation - FAPESP (www.fapesp.br) through the grant 2004/15039-0, and the National Research and Technology Development Council - CNPq (www.cnpq.br) through the grant 420122/2005-2. Wagner Ribeiro received a doctorate scholarship from CNPQ (141467/2007-0) and a one-year scholarship from the Brazilian Coordination for Improvement of Faculty Personnel - CAPES (www.capes.gov.br), Proc.4516/07-9, for a one-year training at the Institute of Psychiatry - King's College London. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.