title: Body fat composition: a predictive factor for obstructive sleep apnea.
abstract: OBJECTIVE
  To investigate body fat composition, measured by bioelectrical impedance assay (BIA), for predicting the presence and severity of obstructive sleep apnea-hypopnea syndrome (OSAHS). Body fat composition was also compared with other well-known OSAHS predictors such as body mass index (BMI), neck circumference, and abdominal visceral fat.
  
  
  METHODS
  A prospective study was designed. Fifty-one patients (41 male, 10 female), who were referred to Hacettepe University Faculty of Medicine, Department of Otorhinolaryngology, Head and Neck Surgery with suspected OSAHS, between April 2003 and June 2004, were included in the study.
  
  
  METHODS
  All patients underwent polysomnography (PSG) and were classified according to their apnea-hypopnea index (AHI) into four groups. The cross-sectional area of abdominal visceral fat was measured by computed tomography (CT) scanning in 33 of the patients. Neck circumference and BMI was measured for all patients. BIA was performed to determine body fat composition. The groups were compared, and correlation of the variables with AHI was investigated.
  
  
  RESULTS
  Of the variables, BMI and percentage of body fat (determined by BIA) were found to be significantly correlated with AHI (r = 0.782, r = 0.647). CT of cross-sectional area of abdominal visceral fat provided 100% sensitivity and specificity (P < .001) in differentiating simple snorers from OSAHS patients. By combining percentage of body fat and body fat mass, higher levels of sensitivity (95%) and specificity (100%) were achieved for diagnosis of OSAHS.
  
  
  CONCLUSIONS
  It was concluded that the BIA could be an inexpensive and practical alternative to prePSG screening tests and should be included in the evaluation of OSAHS patients.
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, Hacettepe University Faculty of Medicine, 06100 Hacettepe, Ankara, Turkey.
authors.forename: Oğuz
authors.initials: O
authors.lastname: Oğretmenoğlu
authors.forename: Ahmet Emre
authors.initials: AE
authors.lastname: Süslü
authors.forename: Omer Taşkin
authors.initials: OT
authors.lastname: Yücel
authors.forename: Tevfik Metin
authors.initials: TM
authors.lastname: Onerci
authors.forename: Altay
authors.initials: A
authors.lastname: Sahin
mesh_terms: D000328:Adult; D017677:Age Distribution; D001823:Body Composition / Q000502:physiology*; D015992:Body Mass Index; D015331:Cohort Studies; D017097:Electric Impedance; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000503:physiopathology*; D017286:Polysomnography; D011379:Prognosis; D011446:Prospective Studies; D012372:ROC Curve; D012307:Risk Factors; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D017678:Sex Distribution; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis* / Q000453:epidemiology* / Q000628:therapy