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. 2022 Nov 30;14:2123–2132. doi: 10.2147/NSS.S388238

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© 2022 Wang et al.

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Flow chart of the identification of the study population. Based on the exclusion criteria, 775 patients with OSA were included in the final analysis.

Notes: Light hypoxia was defined as T90≤5%, mild hypoxia was defined as T90 accounting for 5%-10%, moderate hypoxia was defined as T90 accounting for 10%-25%, severe hypoxia was defined as T90>25%.

Abbreviations:PSG, polysomnography; AHI, apnea hypopnea index; OSA, obstructive sleep apnea; T90, proportion of cumulative sleep time with oxygen saturation below 90% in total sleep time.