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Receiver-operator characteristic (ROC) curves of oxygen desaturation index (ODI)-2%, ODI-3%, and ODI-4% for the diagnosis of moderate-severe (A) and severe (B) obstructive sleep apnea (OSA). Moderate-severe OSA was defined as an apnea-hypopnea index (AHI) ≥ 15. Severe OSA was defined as an AHI ≥ 30.
