Introduction Cross-sectional studies have reported associations between depression and chronic diseases, however it is necessary adjust the analysis for potential confounders. The aim of this study was to examine the association between depression and chronic diseases among adults after controlling for potential confounders.
Methods This is a population-based cross-sectional study with a sample of 1720 adults aged 20–59 years from Florianópolis, Brazil. Interviews and anthropometric measures were performed at adults' households in 2009 and included data about socio demographic characteristics, 11 self-reported chronic diseases, use of health services and physical activity at leisure time. Poisson regression models were carried out to estimate Prevalence Ratios (PR) for the association between depression and chronic diseases (none; one; two or more chronic diseases) after controlling for sex, age, marital status, income, physical activity at leisure time and hospitalisation in the last 12 months.
Results The prevalence of depression was 17.1% (95% CI 14.9% to 19.2%). Even after adjusting for potential confounders the association between depression and chronic diseases remained statistically significant. Those with one chronic disease presented a prevalence of depression 40% (PR 1.4; 95% CI 1.05 to 1.87) higher than people without disease; the prevalence of depression was 120% (PR 2.2; 95% CI 1.70 to 2.87) higher among those with two or more chronic diseases.
Conclusion There is an association between depression and chronic diseases regardless potential confounders.
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