title: Sleep disorders in regional sleep centers: a national cooperative study. Coleman II Study Investigators.
abstract: OBJECTIVE
  In the last two decades there has been an increase in the awareness of and professional expertise in sleep disorders. The objective of this study was to determine the spectrum of sleep-related disorders diagnosed in regional sleep centers and compare this to a previous survey published in 1982.
  
  
  METHODS
  A two-month prospective point-prevalence survey
  
  
  METHODS
  Nineteen accredited regional sleep centers in the United States.
  
  
  METHODS
  Patients evaluated at regional sleep centers during a two-month period.
  
  
  METHODS
  NA.
  
  
  RESULTS
  Obstructive sleep apnea, narcolepsy, and restless legs syndrome were the top three reported primary diagnoses with a prevalence of 67.8%, 4.9%, and 3.2%, respectively. The entire range of sleep disorders, however, was represented in the study sample. Nearly a third of patients had either a primary or secondary diagnosis of a non-respiratory sleep disorder. Referral physicians were most likely to be from internal medicine, pulmonary medicine, and otolaryngology. Compared to the previous survey from 1982, there has been an absolute increase in patient referrals/center with a two- to four-fold increase in the number of patients/center with a final diagnosis of a non-respiratory sleep-related problem. Moreover, there has been a greater than twenty-fold increase in the diagnosis of obstructive sleep apnea.
  
  
  CONCLUSIONS
  Regional sleep centers are encountering increasing patient referrals and a broad range of sleep-related disorders. The predominant reasons for referral are related to obstructive sleep apnea, narcolepsy, and restless legs syndrome.
authors.affiliation: Johns Hopkins University, Baltimore, MD, USA. naresh@welch.jhu.edu
authors.forename: N M
authors.initials: NM
authors.lastname: Punjabi
authors.forename: D
authors.initials: D
authors.lastname: Welch
authors.forename: K
authors.initials: K
authors.lastname: Strohl
mesh_terms: D000328:Adult; D000368:Aged; D015992:Body Mass Index; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D015995:Prevalence; D011446:Prospective Studies; D012893:Sleep Wake Disorders / Q000175:diagnosis / Q000453:epidemiology*; D014851:Wakefulness / Q000502:physiology