title: [Prevalence of asthma and risk factors associated: population based study in São Paulo, Southeastern Brazil, 2008-2009].
abstract: OBJECTIVE
  To assess the prevalence of asthma and risk factors associated in children and adolescents.
  
  
  METHODS
  Population-based cross-sectional study with 1,185 female and male children and adolescents carried out in the city of São Paulo, Southeastern Brazil, from 2008 to 2009. Data were collected through home interviews. Respondents were selected from two-stage (census tract, household) cluster random sampling stratified by gender and age. Multiple Poisson regression was used in the adjusted analysis between the outcome and socioeconomic, demographic, lifestyle and health condition variables.
  
  
  RESULTS
  Of all respondents, 9.1% (95%CI 7.0;11.7) reported asthma. After adjustment, the following variables were found independently associated with asthma: age (0 to 4 years vs. 15 to 19) (PR 3.18, 95%CI 1.20;8.42); age (5 to 9 years vs. 15 to 19) (PR 6.37, 95%CI 2.64;15.39); age (10 to 14 years vs. 15 to 19) (PR 4.51, 95%CI 1.95;10.40); allergy (yes vs. no) (PR 2.22, 95%CI 1.24;4.00); rhinitis (yes vs. no) (PR 2.13, 95%CI 1.22;3.73); health conditions in the 15 days preceding the interview (yes vs. no) (PR 1.96, 95%CI 1.23;3.11); number of rooms in the household (1 to 3 vs. 4 and more) (PR 1.67, 95%CI 1.05;2.66); and skin color (black and mixed vs. white) (PR 2.00, 95%CI 1.14;3.49).
  
  
  CONCLUSIONS
  This study showed the importance of factors associated with asthma including rhinitis and allergy; age between 5 to 9 years old; black and mixed skin color; and household with few rooms. Frequent health problems are seen as a common consequence of asthma.
authors.affiliation: Programa de Pós-Graduação em Saúde Pública, Departamento de Epidemiologia, Faculdade de Saúde Pública, Universidade de São Paulo, São Paulo, SP, Brasil. clovissousa@usp.br
authors.forename: Clóvis Arlindo de
authors.initials: CA
authors.lastname: Sousa
authors.forename: Chester Luiz Galvão
authors.initials: CL
authors.lastname: César
authors.forename: Marilisa Berti de Azevedo
authors.initials: MB
authors.lastname: Barros
authors.forename: Luana
authors.initials: L
authors.lastname: Carandina
authors.forename: Moisés
authors.initials: M
authors.lastname: Goldbaum
authors.forename: Júlio Cesar Rodrigues
authors.initials: JC
authors.lastname: Pereira
mesh_terms: D000293:Adolescent; D000328:Adult; D001249:Asthma / Q000453:epidemiology*; D015992:Body Mass Index; D001938:Brazil / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D006967:Hypersensitivity / Q000453:epidemiology; D007223:Infant; D008297:Male; D015995:Prevalence; D012307:Risk Factors; D012959:Socioeconomic Factors; D014505:Urban Population; D055815:Young Adult