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Relationship between oxyhemoglobin saturation and either age or BMI. We plotted the mean oxyhemoglobin saturation by deciles of age and BMI, respectively, and stratified by sex. Numbers in the x-axis represent the starting value of each decile. The graphs show a dose-response relationship with age or BMI corresponding to an incrementally lower oxyhemoglobin saturation, in both men and women. BMI, body mass index.
