title: Differences in spirometry values between U.S. children 6-11 years and adolescents 12-19 years with current asthma, 2007-2010.
abstract: BACKGROUND
  National Asthma Education and Prevention Program (NAEPP) guidelines recommend that periodic spirometry be performed in youth with asthma. NAEPP uses different spirometry criteria to define uncontrolled asthma for children (6-11 years) and adolescents (12+ years).
  
  
  OBJECTIVE
  To describe differences in spirometry between U.S. children and adolescents with current asthma.
  
  
  METHODS
  We examined cross-sectional spirometry data from 453 U.S. youth with current asthma age 6-19 years from the 2007-2010 National Health and Nutrition Examination Surveys. The main outcomes were percentage predicted forced expiratory volume at 1 sec (FEV1%) ≤80 and the ratio of FEV1 to forced vital capacity (FEV1/FVC) ≤0.80. We also examined the prevalence of youth with spirometry values consistent with uncontrolled asthma, using NAEPP age-specific criteria, defined for children aged 6-11 years as FEV1% ≤80 or FEV1/FVC ≤0.80, and for adolescents aged 12-19 years as FEV1% ≤80.
  
  
  RESULTS
  Children 6-11 years and adolescents 12-19 years did not differ in prevalence of FEV1% ≤80 (10.1% vs. 9.0%) or FEV1/FVC ≤0.80 (30.6% vs. 29.8%). However, based on the NAEPP age-specific criteria, 33.0% of children 6-11 years and 9.0% of adolescents 12-19 years had spirometry values consistent with uncontrolled asthma (P < 0.001).
  
  
  CONCLUSIONS
  Children 6-11 years and adolescents 12-19 years with current asthma did not differ in the percentage with FEV1% ≤80 or FEV1/FVC ≤0.80. However, the percent of children and adolescents with spirometry values consistent with uncontrolled asthma did differ. The difference appears to stem mainly from the different spirometry criteria for the two age groups.
authors.affiliation: Division of Health and Nutrition Examination Surveys, National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland.|United States Public Health Service, Rockville, Maryland.
authors.forename: Brian K
authors.initials: BK
authors.lastname: Kit
authors.affiliation: Office of Analysis and Epidemiology, National Center for Health Statistics, Centers for Disease Control and Prevention Hyattsville, Hyattsville, Maryland.
authors.forename: Alan E
authors.initials: AE
authors.lastname: Simon
authors.affiliation: Division of Health and Nutrition Examination Surveys, National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland.
authors.forename: Timothy
authors.initials: T
authors.lastname: Tilert
authors.affiliation: Department of Pediatrics, Division of Pediatric Pulmonology, David Geffen School of Medicine at UCLA, Mattel Children's Hospital UCLA, Los Angeles, California.
authors.forename: Sande
authors.initials: S
authors.lastname: Okelo
authors.affiliation: United States Public Health Service, Rockville, Maryland.|Office of Analysis and Epidemiology, National Center for Health Statistics, Centers for Disease Control and Prevention Hyattsville, Hyattsville, Maryland.
authors.forename: Lara J
authors.initials: LJ
authors.lastname: Akinbami
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001249:Asthma / Q000175:diagnosis* / Q000503:physiopathology; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D005541:Forced Expiratory Volume / Q000502:physiology*; D006801:Humans; D008297:Male; D012129:Respiratory Function Tests; D013147:Spirometry / Q000592:standards*; D014481:United States; D055815:Young Adult
keywords: NHANES; adolescent; asthma; child; spirometry