title: [Validity of peak flow record in asthmatic children residing in Mexico City].
abstract: OBJECTIVE
  To determine the concordance between maximum peak expiratory flow records (PEFr) reported by the parents of asthmatic children and the electronic values stored by the AirWatch device (PEFe).
  
  
  METHODS
  Records of PEF measurements between October 1998 and 1999 were obtained from 42 asthmatic children 5 to 15 years of age recruited at the Hospital Infantil de Mexico Federico Gomez, in Mexico City. Parents recorded the maximum value in the health diary. Spearman correlation was calculated between PEFe and PEFr and a mixed-effects logistic model was used.
  
  
  RESULTS
  The correlation between PEFe and PEFr was r=0.96 (p<0.05) among children with a diagnosis of moderate or severe asthma and r=0.40 (p<0.05) among children diagnosed with mild asthma. Follow-up time, asthma severity, gender and age of the child and their interactions were predictors of the differences between PEFe and PEFr.
  
  
  CONCLUSIONS
  Parents of children with moderate or severe asthma from 6 to 8 years of age report PEF values with greater accuracy during follow-up than others.
authors.affiliation: Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México.
authors.forename: Diana
authors.initials: D
authors.lastname: Jiménez-Millán
authors.forename: Matiana
authors.initials: M
authors.lastname: Ramírez-Aguilar
authors.forename: Hortensia
authors.initials: H
authors.lastname: Moreno-Macías
authors.forename: Albino
authors.initials: A
authors.lastname: Barraza-Villarreal
authors.forename: Blanca Estela
authors.initials: BE
authors.lastname: del Río-Navarro
authors.forename: Isabelle
authors.initials: I
authors.lastname: Romieu
mesh_terms: D000293:Adolescent; D001249:Asthma / Q000503:physiopathology*; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico; D010366:Peak Expiratory Flow Rate; D014505:Urban Population