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Arterial blood gas values by altitude based on aggregated data

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The size of each bubble is proportional to the standard error of each of the 51 studies shown in the figure. The 95% confidence interval (gray area) is the standard error of the estimate (ie, the standard error of the point estimation for one observation). (Source: Forrer A, Gaisl T, Sevik A, et al. Partial pressure of arterial oxygen in healthy adults at high altitudes: a systematic review and meta-analysis. JAMA Netw Open 2023;6[6]:e2318036. Creative Commons Attribution 4.0 International [CC BY 4.0] license, creativecommons.org/licenses/by/4.0.)