title: Cross-Sectional Study of Obstructive Sleep Apnea Syndrome in Japanese Public Transportation Drivers: Its Prevalence and Association With Pathological Objective Daytime Sleepiness.
abstract: This study investigates obstructive sleep apnea syndrome (OSAS) prevalence among Japanese occupational drivers and factors associated with a pathological level of objective daytime sleepiness.
  
  
  
  Portable monitoring device (PMD) screening was applied to 2389 Japanese male public transportation traffic drivers. Nocturnal polysomnography (n-PSG) and multiple sleep latency tests (MSLT) were administered to subjects with apnea-hypopnea index (AHI) at least 15 on PMD.
  
  
  
  In all, 235 subjects were diagnosed as having OSAS (9.8%). AHI on n-PSG at least 40 and Epworth Sleepiness Scale score at least 11 were extracted as factors associated with mean sleep latency on MSLT less than 5 minutes.
  
  
  
  Prevalence of OSAS in male Japanese public transportation traffic drivers was 9.8% or greater. Individuals aware of excessive daytime sleepiness and with severe OSAS were inferred as exhibiting a pathological level of objective daytime sleepiness.
authors.affiliation: Department of Somnology, Tokyo Medical University (Drs Sasai-Sakuma, Inoue); Department of Life Sciences and Bio-informatics, Division of Biomedical Laboratory Sciences, Graduate School of Health Sciences, Tokyo Medical and Dental University (Dr Sasai-Sakuma); and Japan Somnology Center, Neuropsychiatric Research Institute, Tokyo (Mr Kikuchi, Dr Inoue).
authors.forename: Taeko
authors.initials: T
authors.lastname: Sasai-Sakuma
authors.forename: Katsunori
authors.initials: K
authors.lastname: Kikuchi
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Inoue
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology*; D017286:Polysomnography; D015995:Prevalence; D020181:Sleep Apnea, Obstructive / Q000453:epidemiology*; D014186:Transportation; D000078329:Workforce