Figure 2. Associations Between Oxygenation Measures and Supplemental Oxygen Delivery Rates Stratified by Race and Ethnicity.

A, Association between pulse oximetry (SpO₂) and hemoglobin oxygen saturation with smoothing curves. B, Oxygen delivery rates by race and ethnicity. C, Association between oxygen delivery rates and hemoglobin oxygen saturation with smoothing curves. D, Association between oxygen delivery rates and SpO₂ with smoothing curves. For clarity, oxygen delivery rates up to 10 L/min are shown in panels C and D. Spearman correlation coefficients (ρ) are given for each race and ethnicity.