Sleep board review question: nocturnal hypoxemia in COPD

No abstract available. Article truncated at end of question. Question: Which of the following is the strongest predictor of nocturnal hypoxemia in patients with chronic obstructive pulmonary disease (COPD)?1.Forced expiratory volume in 1 second (FEV1)2.Age3.Daytime Oxygen Saturation4.Radiological severity of COPD…