title: Impact of parental smoking on childhood asthma.
abstract: OBJECTIVE
  To evaluate the exposure to environmental tobacco smoke (ETS) of the childhood population in this community and its relationship with asthma symptoms.
  
  
  METHODS
  A cross-sectional study was conducted using the International Study of Asthma and Allergies in Childhood (ISAAC) questionnaire on children and adolescents in this community. The symptoms "wheezing ever", "current asthma", "severe asthma", and "exercise-induced asthma" were defined by this questionnaire. Parental smoking was classified into four mutually exclusive categories: 1) no parent smokes; 2) only the mother smokes; 3) only the father smokes; and 4) both parents smoke. The odds ratio of the prevalence of asthma symptoms according to ETS exposure was calculated using logistic regression.
  
  
  RESULTS
  A total of 10,314 children and 10,453 adolescents were included. Over 51% of the children and adolescents were exposed to ETS at home. ETS is associated with a higher prevalence of asthma symptoms, particularly if the mother or both parents smoke.
  
  
  CONCLUSIONS
  The prevalence of ETS is still high in this community, although there has been a decreasing tendency in the last 15 years. ETS is associated with higher prevalence of asthma.
authors.affiliation: Departamento de Enfermedades del Aparato Respiratorio, Hospital Clínico Universitario, Santiago de Compostela, Spain. francisco.jaiver.gonzalez.barcala@sergas.es
authors.forename: Francisco-Javier
authors.initials: FJ
authors.lastname: Gonzalez-Barcala
authors.forename: Sonia
authors.initials: S
authors.lastname: Pertega
authors.forename: Manuel
authors.initials: M
authors.lastname: Sampedro
authors.forename: Juan Sanchez
authors.initials: JS
authors.lastname: Lastres
authors.forename: Miguel Angel San Jose
authors.initials: MA
authors.lastname: Gonzalez
authors.forename: Luis
authors.initials: L
authors.lastname: Bamonde
authors.forename: Luciano
authors.initials: L
authors.lastname: Garnelo
authors.forename: Teresa Perez
authors.initials: TP
authors.lastname: Castro
authors.forename: Luis
authors.initials: L
authors.lastname: Valdés-Cuadrado
authors.forename: Jose-M
authors.initials: JM
authors.lastname: Carreira
authors.forename: Jose-D
authors.initials: JD
authors.lastname: Moure
authors.forename: Angel Lopez
authors.initials: AL
authors.lastname: Silvarrey
mesh_terms: D000293:Adolescent; D001249:Asthma / Q000453:epidemiology* / Q000209:etiology; D002648:Child; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D010290:Parents; D012907:Smoking / Q000453:epidemiology*; D014028:Tobacco Smoke Pollution / Q000009:adverse effects*
chemical_list: D014028:Tobacco Smoke Pollution