Baseline subject characteristics, overall and by presence of nocturnal hypoxia^*.

<p>Abbreviations: eGFR, estimated glomerular filtration rate; RDI, respiratory disturbance index; BMI, body mass index; COPD, chronic obstructive pulmonary disease; ACEI, angiotensin converting enzyme inhibitor; ARB, angiotensin receptor blocker.</p><p>Cardiovascular Medications include acetylsalicylic acid, nitrates, calcium channel blockers, beta blockers, arrhythmia medications, and lipid lower medications.</p><p>*Results presented as mean (standard deviation) unless otherwise indicated.</p>†<p>p-value for categorical variables based on a chi-square test of independence; p-value for continuous variables based on a 2-sample t-test for a difference, assuming equal variances.</p>‡<p>Neck Circumference: n = 683 (Overall), n = 381 (Nocturnal Hypoxia absent), n = 302 (Nocturnal Hypoxia present).