title: A comparison of Asian and white patients with obstructive sleep apnea syndrome.
abstract: OBJECTIVE
  To evaluate the possible differences between Asian and white patients with obstructive sleep apnea syndrome.
  
  
  METHODS
  A retrospective review of Asian and white patients during a 12-month period was conducted. Patients with respiratory disturbance index (RDI) > or = 15 based on polysomnography were included in the study. Variables examined include age, sex, body mass index (BMI), RDI, lowest oxygen saturation (LSAT), and cephalometric analysis data.
  
  
  RESULTS
  Fifty-eight Asian patients (53 men) and 293 white patients (260 men) were studied. The Asians were younger (44.1 +/- 9.8 vs. 47.5 +/- 11.6 y, P = .02), and the mean BMI (kg/m2) was 26.6 +/- 3.7 in the Asians and 30.7 +/- 5.9 in the whites (P < .001). The mean RDI was similar (56.6 +/- 34.9 vs. 55.6 +/- 26.9, P = NS), but the mean LSAT was lower in the whites (77.7 +/- 9.9% vs. 70.0 +/- 15.6%, P < .001). Based on the cephalometric data, the Asians have maxillomandibular protrusion, narrower cranial base angle, larger posterior airway space, and more superiorly positioned hyoid bone compared with the whites.
  
  
  CONCLUSIONS
  Although male gender was found to be an important risk factor for obstructive sleep apnea syndrome in both Asian and white patients, obesity may be a less significant risk factor in the Asians because the majority of our Asian patients were nonobese. There was also variability in the craniomandibular factors that contributed to obstructive sleep apnea syndrome in the two groups.
authors.affiliation: Stanford University Sleep Disorders and Research Center, California, USA. kaseyli@hotmail.com
authors.forename: K K
authors.initials: KK
authors.lastname: Li
authors.forename: N B
authors.initials: NB
authors.lastname: Powell
authors.forename: C
authors.initials: C
authors.lastname: Kushida
authors.forename: R W
authors.initials: RW
authors.lastname: Riley
authors.forename: B
authors.initials: B
authors.lastname: Adornato
authors.forename: C
authors.initials: C
authors.lastname: Guilleminault
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001213:Asian; D015992:Body Mass Index; D002508:Cephalometry; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D012307:Risk Factors; D012891:Sleep Apnea Syndromes / Q000175:diagnosis / Q000208:ethnology*; D044465:White People