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. 2022 Feb 22;50(3):e253–e262. doi: 10.1097/CCM.0000000000005309

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Figure 3. — Primary analyses of mortality according to high-flow nasal cannula (HFNC) exposure, stratified by degree of hypoxemia. Similar to Figure 2, these Kaplan-Meier curves depict cumulative survival in patients with any HFNC exposure and in HFNC patients not intubated within 6 hr of admission as well as their respective matched controls. However, in this iteration, patients have also been matched by their degree of hypoxemia (ratio of oxygen saturation/Fio₂ [S/F] > 200 or < 200). p value of less than 0.05 for comparison between the more hypoxemic HFNC patients not intubated within 6 hr of admission and their matched controls. aHR = adjusted hazard ratio.