Violence and social determinants of health in Brazil: association between homicides, urbanization, population, inequality, and development.

Abstract

The aim was to analyze the relations between homicidal violence, human development, inequality, population size, and urbanization rates in Brazilian municipalities. This is a retrospective ecological study of 5,570 Brazilian municipalities which analyzes the relations between the average rate of homicides registered in the Brazilian Mortality Information System (from 2005 to 2015) and selected indicators: municipal human development indices (HDI-M), Gini index, urbanization rates, and quantitative population. Analysis of the relative effect (%) of the variables on the risk for homicidal violence showed a greater association with more populous municipalities (log 10) (80.8%, 95%CI: 73.0; 88.8), more urbanized ones (8%, 95%CI: 6.7; 9.2), with higher Gini index (6%, 95%CI: 2.6; 9.5); whereas the relation with HDI-M is inverse (-17.1%, 95%CI: -21.4; -12.6). National policies which aim to limit population growth and the urbanization of the most populous Brazilian cities could reduce homicide rates across the country. Reducing inequalities and investing in municipal social education, health, and income policies could also reduce the number of homicides. We estimated that improving the HDI-M of the municipalities by 0.1 would cause a national reduction between 7,560 and 12,834 annual homicides, whereas decreasing income inequality (Gini index) by 0.1 would mean saving between 1,569 to 5,448 lives per year.