title: Correlation between cephalometric data and severity of sleep apnea.
abstract: BACKGROUND
  Obstructive sleep apnea syndrome has a high prevalence among adults. Cephalometric variables can be a valuable method for evaluating patients with this syndrome.
  
  
  OBJECTIVE
  To correlate cephalometric data with the apnea-hypopnea sleep index.
  
  
  METHODS
  We performed a retrospective and cross-sectional study that analyzed the cephalometric data of patients followed in the Sleep Disorders Outpatient Clinic of the Discipline of Otorhinolaryngology of a university hospital, from June 2007 to May 2012.
  
  
  RESULTS
  Ninety-six patients were included, 45 men, and 51 women, with a mean age of 50.3 years. A total of 11 patients had snoring, 20 had mild apnea, 26 had moderate apnea, and 39 had severe apnea. The distance from the hyoid bone to the mandibular plane was the only variable that showed a statistically significant correlation with the apnea-hypopnea index.
  
  
  CONCLUSIONS
  Cephalometric variables are useful tools for the understanding of obstructive sleep apnea syndrome. The distance from the hyoid bone to the mandibular plane showed a statistically significant correlation with the apnea-hypopnea index.
authors.affiliation: Universidade Estadual de Campinas, Campinas, SP, Brazil.
authors.forename: Vanessa Gonçalves
authors.initials: VG
authors.lastname: Silva
authors.affiliation: Universidade Estadual de Campinas, Campinas, SP, Brazil.
authors.forename: Laíza Araújo Mohana
authors.initials: LA
authors.lastname: Pinheiro
authors.affiliation: Universidade Estadual de Campinas, Campinas, SP, Brazil.
authors.forename: Priscila Leite da
authors.initials: PL
authors.lastname: Silveira
authors.affiliation: Universidade Estadual de Campinas, Campinas, SP, Brazil.
authors.forename: Alexandre Scalli Mathias
authors.initials: AS
authors.lastname: Duarte
authors.affiliation: Universidade Estadual de Campinas, Campinas, SP, Brazil.
authors.forename: Ana Célia
authors.initials: AC
authors.lastname: Faria
authors.affiliation: Universidade Estadual de Campinas, Campinas, SP, Brazil.
authors.forename: Eduardo George Baptista de
authors.initials: EG
authors.lastname: Carvalho
authors.affiliation: Universidade Estadual de Campinas, Campinas, SP, Brazil.
authors.forename: Edilson
authors.initials: E
authors.lastname: Zancanella
authors.affiliation: Universidade Estadual de Campinas, Campinas, SP, Brazil.
authors.forename: Agrício Nubiato
authors.initials: AN
authors.lastname: Crespo
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002508:Cephalometry / Q000379:methods*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D012189:Retrospective Studies; D012720:Severity of Illness Index; D020181:Sleep Apnea, Obstructive / Q000503:physiopathology*; D012913:Snoring / Q000503:physiopathology*; D055815:Young Adult