title: [Spirometric values in healthy children of the urban area of the Basque Autonomic Community].
abstract: OBJECTIVE
  Our objective was to obtain spirometric reference values for children.
  
  
  METHODS
  We performed a transversal study in schools in Bilbao of children of both sexes that were between 7 and 14 years of age, non-smokers and healthy (according to a questionnaire and physical examination). A sample of 657 subjects was calculated based on the standard deviations of height for each sex and age group. The sample units were the schools and they were selected randomly. The following data were collected: age, sex, weight, height, FVC, FEV1, FEV1/FEC, PEF, FEF25, FEF50, FEF75 and FEF25-75. Forced spirometry was carried out according to the ATS guidelines by using a MasterScreen model 4.10.b (Jaeger, Germany). A descriptive statistical study was performed, as well as a normality test and linear regression.
  
  
  RESULTS
  We studied 765 subjects (415 boys and 350 girls). The natural logarithm of the spirometric variables was taken to obtain a Gaussian distribution. These variables were related to age, weight and height. The relationship improved when associated with sex, with the best association being between height and sex. The equations obtained were only valid for FVC and FEV1, and were as follows: in boys FVC(L) = -1.968 + 0.020 height and FEV1(L) = -1.831 + 0.018 height and for girls FVC(L) = -1.879 + 0.019 height and FEV1(L) = -1.809 + 0.018 height [R2 = 0.893, 0.891, 0.868 and 0.871, respectively].
  
  
  CONCLUSIONS
  The pediatric reference values for forced spirometry were established for our population, complying with the current applicable guidelines.
authors.affiliation: Servicio de Pediatría, Hospital Basurto, Bilbao.
authors.forename: M D
authors.initials: MD
authors.lastname: Morato Rodríguez
authors.forename: E
authors.initials: E
authors.lastname: González Pérez-Yarza
authors.forename: J I
authors.initials: JI
authors.lastname: Emparanza Knörr
authors.forename: A
authors.initials: A
authors.lastname: Pérez Legorburu
authors.forename: A
authors.initials: A
authors.lastname: Aguirre Conde
authors.forename: A
authors.initials: A
authors.lastname: Delgado Rubio
mesh_terms: D000293:Adolescent; D002391:Catchment Area, Health; D002648:Child; D003153:Community Health Services; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008449:Maximal Expiratory Flow-Volume Curves; D012016:Reference Values; D012189:Retrospective Studies; D013030:Spain; D013147:Spirometry / Q000379:methods*; D014504:Urban Health; D014505:Urban Population
vernacular_title: Valores espirométricos en niños sanos de un área urbana de la Comunidad Autónoma Vasca.