title: How the presence of rhinoconjunctivitis and the severity of asthma modify the relationship between obesity and asthma in children 6-7 years old.
abstract: BACKGROUND
  The association between asthma and obesity in children, and the effect modification of allergy on this association have not been fully established. Aims The objective of the study was to know the effect modification of the severity of asthma and of the coexistence of rhinoconjunctivitis (RC) in the relationship between obesity and asthma.
  
  
  METHODS
  A cross-sectional study of 17 145 schoolchildren 6-7 years old from eight Spanish cities who had completed information on height and weight of the ISAAC phase III questionnaire, which also included questions about asthma and RC symptoms and on various risk factors. Body mass index (BMI) was used to define obesity according to international standards. Two different logistic regressions, using current occasional asthma (COA) and current severe asthma (CSA) as dependent variables, were made stratifying for gender and for the coexistence of RC and controlling for age, older and younger siblings, exercise, mother's education, truck traffic, cat/dog during the first year of life and smoking father or mother.
  
  
  RESULTS
  Obesity was a risk factor of CSA without RC, both for boys (1.92, CI 95% 1.13-3.25) and for girls (2.99, CI 95% 1.68-5.32). Every BMI unit increment increased by 6.7% the risk of CSA without RC in boys and by 12.4% in girls. Obesity was not a risk factor for CSA with RC. The association between COA and obesity was weaker and the coexistence of RC did not modify it greatly.
  
  
  CONCLUSIONS
  Obese schoolchildren are more at risk of suffering from non-allergic asthma than the non-obese subjects.
authors.affiliation: Institute of Respiratory Health, University of Murcia, Murcia, Spain. lgmarcos@um.es
authors.forename: L
authors.initials: L
authors.lastname: Garcia-Marcos
authors.forename: A
authors.initials: A
authors.lastname: Arnedo Pena
authors.forename: R
authors.initials: R
authors.lastname: Busquets-Monge
authors.forename: M
authors.initials: M
authors.lastname: Morales Suárez-Varela
authors.forename: N
authors.initials: N
authors.lastname: García de Andoin
authors.forename: J
authors.initials: J
authors.lastname: Batlles-Garrido
authors.forename: A
authors.initials: A
authors.lastname: Blanco-Quirós
authors.forename: A
authors.initials: A
authors.lastname: López-Silvarrey Varela
authors.forename: G
authors.initials: G
authors.lastname: García-Hernández
authors.forename: I
authors.initials: I
authors.lastname: Aguinaga-Ontoso
authors.forename: C
authors.initials: C
authors.lastname: González-Díaz
authors.forename: A
authors.initials: A
authors.lastname: Garcia-Merino
mesh_terms: D001249:Asthma / Q000150:complications / Q000453:epidemiology*; D015992:Body Mass Index; D002648:Child; D003233:Conjunctivitis, Allergic / Q000150:complications / Q000453:epidemiology*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D009765:Obesity / Q000150:complications / Q000453:epidemiology*; D012307:Risk Factors; D012737:Sex Factors; D013030:Spain / Q000453:epidemiology; D011795:Surveys and Questionnaires