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Stratification of nocturnal SpO2 in healthy subjects according to the altitude of residency

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Nocturnal SpO₂ levels are calculated from nocturnal pulse oximetry recordings and represent percentage of recording time spent at a given SpO₂ value. Distribution of SpO₂ during the night differed significantly among the three groups. Abbreviations: le, level; Perc.: percentage; SpO₂: oxygen saturation. (Source: Perger E, Baillieul S, Esteve F, et al. Nocturnal hypoxemia, blood pressure, vascular status and chronic mountain sickness in the highest city in the world. Ann Med 2022;54[1]:1884-93. Creative Commons Attribution [CC BY 4.0] license, creativecommons.org/licenses/by/4.0.)