Covariates
oxygen desaturation, apnea
Baseline characteristics of the study sample, including age, sex, race, body weight, smoking status, alcohol use, medical history, and medication use, were acquired from the SHHS baseline survey and parent study. The apnea‐hypopnea index was defined as all episodes of apnea and hypopnea per hour associated with an oxygen desaturation of ≥4%. The percentage of sleep time with oxygen desaturation <90% (T