title: Birth anthropometric measures, body mass index and allergic diseases in a birth cohort study (BAMSE).
abstract: OBJECTIVE
  We aimed to assess increased birth weight or birth length in relation to allergic diseases at 4 years of age, taking body mass index (BMI) at age 4 as a covariate in the adjustment.
  
  
  METHODS
  The parents of a large prospective birth cohort answered questionnaires on environmental factors and allergic symptoms when their children were 2 months and 1, 2 and 4 years old. Perinatal data on weight and length at birth were received from the child care health centres. The children were clinically examined at 4 years of age and height and weight recorded. Blood was drawn for analysis of specific IgE antibodies to common inhalant allergens. Risk associations between birth anthropometric measures and wheeze, allergic diseases or sensitisation were estimated in multivariate logistic regression analyses (n = 2869).
  
  
  RESULTS
  There were no clear overall associations between birth weight and allergic diseases at 4 years of age. Birth length > or =90th percentile was inversely associated with any wheeze at age 4 (adjusted OR 0.64, 95% CI 0.44 to 0.92) but was significantly associated only with late-onset wheeze (adjusted OR 0.40, 95% CI 0.21 to 0.77). No such associations were seen for persistent or transient wheeze, eczema, rhinitis or allergic sensitisation. Transient wheeze during the first 2 years of age tended to be associated with increased BMI at age 4.
  
  
  CONCLUSIONS
  Increased birth weight was not associated with wheeze or allergic disease. Increased birth length may play a protective role in late-onset wheeze in early childhood.
authors.affiliation: Faculty of Pharmacy, University of Manitoba, Winnipeg, Canada. xmai@mich.ca
authors.forename: Xiao-Mei
authors.initials: XM
authors.lastname: Mai
authors.forename: Catarina
authors.initials: C
authors.lastname: Almqvist
authors.forename: Lennart
authors.initials: L
authors.lastname: Nilsson
authors.forename: Magnus
authors.initials: M
authors.lastname: Wickman
mesh_terms: D000886:Anthropometry; D001724:Birth Weight / Q000235:genetics*; D015992:Body Mass Index; D002675:Child, Preschool; D015331:Cohort Studies; D004739:England / Q000453:epidemiology; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D011247:Pregnancy; D015995:Prevalence; D011446:Prospective Studies; D012130:Respiratory Hypersensitivity / Q000209:etiology* / Q000276:immunology; D012307:Risk Factors; D012882:Skin Tests; D011795:Surveys and Questionnaires