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

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,