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Proportion of patients continuing CPAP over time. The proportion adhering to CPAP continues to fall over the first 4 years of therapy. Reprinted from McArdle N, Devereux G, Heinarnejad H, et al. 1999. Long-term use of CPAP therapy for sleep apnea/hypopnea syndrome. Am J Respir Crit Care Med, 159:1108–14. Copyright © 1999, with permission from American Thoracic Society.
