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Receiver operator characteristics (ROC) curves for in-laboratory nasal flow respiratory disturbance index (NF RDI) and multivariate apnea index (MAP) for diagnosing OSA defined by polysomnography apnea-hypopnea index (PSG AHI) ≥ 5 (A) and for diagnosing severe OSA, defined as PSG AHI ≥ 30 in (B)
