Socioeconomic factors and risk for hospitalisation due to asthma in children in the municipalities of Mato Grosso State, Brazil

This ecological study used data accumulated between 2001 and 2012 hospital admissions of children under five years of age with asthma in 141 municipalities in the Mato Grosso. Hospital data were extracted from the SIH/SUS system, and hospitalisation rates were estimated using the Bayesian inference method. SaTScan software was used for the calculation of the relative risk (RR). Differences in socioeconomic characteristics among municipalities with high and low hospitalization rates were evaluated by nonparametric Wilcoxon-Mann-Whitney test. This test indicates that municipalities with better socioeconomic characteristics have lower hospitalization rates. The analysis of the linear models in the two study periods indicated that the decreasing trend in the number of admissions was 3-fold higher in the 2005-2012 period compared with the 2001-2004 period. In addition, a decrease of 76% in the hospitalisation incidence rate was observed during the 12-year study period; this decrease was more evident from 2005 onward. The municipalities identified as having increased risk of hospitalisation of children with asthma were located in areas subjected to intense burning practices and with low municipal development indices.