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Relationship between FiO2 and the ROX index at SpO2 95% for a range of respiratory rates between 20 and 40 breaths/min. Respiratory rates are shown in the same order as in the key. The gray area indicates ROX < 4.88. FiO2 values of 0.5 and 0.8 are marked with dashed vertical lines. SpO2 = oxygen saturation as measured by pulse oximetry.
