Prevalence and risk factors for wheezing in Salvador, Brazil: a population-based study

causes of visit to emergency rooms among children. However, data on wheezing burden are mostly pro-vided at healthcare setting, and particularly only for infants. Aims: We sought to estimate the prevalence of wheezing in children under 4 years and to assess potential risk factors in the community. Design: This was a cross-sectional analysis of a population-based cohort study. Methods: The sample comprised children aged <4 years living in Salvador, Brazil. Data were collected via home visits when the parents/guardians were interviewed. Data were recorded on standardized forms. Results: Of 1534 children, mean age was 21 1