title: Early Exposure to Traffic-Related Air Pollution, Respiratory Symptoms at 4 Years of Age, and Potential Effect Modification by Parental Allergy, Stressful Family Events, and Sex: A Prospective Follow-up Study of the PARIS Birth Cohort.
abstract: The relation between traffic-related air pollution (TRAP) exposure and the incidence of asthma/allergy in preschool children has been widely studied, but results remain heterogeneous, possibly due to differences in methodology and susceptibility to TRAP.
  
  
  
  We aimed to study the relation of early TRAP exposure with the development of respiratory/allergic symptoms and asthma during preschool years, and to investigate parental allergy, "stressful" family events, and sex as possible effect modifiers.
  
  
  
  We examined data of 2,015 children from the PARIS birth cohort followed up with repeated questionnaires completed by parents until age 4 years. TRAP exposure in each child's first year of life was estimated by nitrogen oxides (NOx) air dispersion modeling, taking into account both home and day care locations. Association between TRAP exposure and patterns of wheezing, dry night cough, and rhinitis symptoms was studied using multinomial logistic regression models adjusted for potential confounders. Effect modification by parental history of allergy, stressful family events, and sex was investigated.
  
  
  
  An interquartile range (26 μg/m3) increase in NOxlevels was associated with an increased odds ratio (OR) of persistent wheezing at 4 years (adjusted OR = 1.27; 95% confidence interval: 1.09, 1.47). TRAP exposure was positively associated with persistent wheeze, dry cough, and rhinitis symptoms among children with a parental allergy, those experiencing stressful family events, and boys, but not in children whose parents did not have allergies or experience stressful events, or in girls (all interactionp-values < 0.2).
  
  
  
  This study supports the hypothesis that not all preschool children are equal regarding TRAP health effects. Parental history of allergy, stressful family events, and male sex may increase their susceptibility to adverse respiratory effects of early TRAP exposure.
authors.affiliation: Laboratoire Santé Publique et Environnement, EA4064, Faculté de Pharmacie de Paris, Université Paris Descartes, Sorbonne Paris Cité, Paris, France.
authors.forename: Fanny
authors.initials: F
authors.lastname: Rancière
authors.forename: Nicolas
authors.initials: N
authors.lastname: Bougas
authors.forename: Malika
authors.initials: M
authors.lastname: Viola
authors.forename: Isabelle
authors.initials: I
authors.lastname: Momas
mesh_terms: D000397:Air Pollution / Q000706:statistics & numerical data*; D001249:Asthma / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D004781:Environmental Exposure / Q000706:statistics & numerical data*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006967:Hypersensitivity / Q000453:epidemiology*; D015994:Incidence; D007223:Infant; D016015:Logistic Models; D008297:Male; D016017:Odds Ratio; D010297:Paris; D011446:Prospective Studies; D012140:Respiratory Tract Diseases / Q000453:epidemiology*; D012307:Risk Factors; D012737:Sex Factors; D013315:Stress, Psychological / Q000453:epidemiology*; D001335:Vehicle Emissions / Q000032:analysis
chemical_list: D001335:Vehicle Emissions