Patient Characteristics.

OSA = obstructive sleep apnea, M = male, F = female, Afr Amer = African American, BMI = body mass index, DM = diabetes mellitus, HTN = hypertension, SBP = systolic blood pressure, DBP = diastolic blood pressure, AHI-4% = apnea-hypopnea index of respiratory events per hour with at least 4% oxygen desaturation, RDI = respiratory disturbance index, O2 sat % = percentage oxygen saturation recorded, Stage N1% = percentage of total sleep in non-REM sleep stage I, Stage N2% = percentage of total sleep in non-REM sleep stage II, Stage N3% = percentage of total sleep in non-REM sleep stage III, REM% = percentage of total sleep in rapid eye movement (REM) sleep. Table shows mean (+/- standard deviation) or N = number of patients falling into category.