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Continuous positive airway pressure (CPAP) is beneficial for patients with moderate-to-severe obstructive sleep apnea (OSA; apnea-hypopnea index [AHI], >15 events/hour), but few studies have been designed to assess CPAP in patients with milder disease. British researchers randomized 233 patients (mean age, 50) with mild OSA (AHI range, 5–15 events/hour) to receive usual care (sleep-hygiene counseling) with or without CPAP for 3 months.
Median CPAP usage was 4 hours nightly. The primary outcome, quality of life as measured by the vitality scale of the Short Form-36 questionnaire (range, 0–100, with higher scores showing better health), increased significantly in the CPAP group (adjusted mean, +7.5 points) and was unchanged in the usual-care g…