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Cumulative survival of patients with obstructive sleep apnea–hypopnea by categories of average daily use of positive airway pressure therapy. Patients with average daily use less than 1 hour had significantly lower cumulative survival than those with an average daily use of 1–6 hours and those with an average daily use exceeding 6 hours. There was no difference in the groups with average daily use of 1–6 hours and more than 6 hours. Reprinted by permission from Reference 48.
