Access to Diagnosis and Treatment of Patients with Suspected Sleep Apnea -- Flemons et al. 169 (6): 668 -- American Journal of Respiratory and Critical Care Medicine

Access to Diagnosis and Treatment of Patients with Suspected Sleep Apnea -- Flemons et al. 169 (6): 668 -- American Journal of Respiratory and Critical Care Medicine: "The United States has an estimated population of 280 million (Central Intelligence Agency—The World Factbook 2002). A nationwide survey in June 2001 estimated that there were 1,292 sleep laboratories in the United States and that 1.17 million polysomnograms were performed in the preceding year (427 polysomnograms/100,000 population)"