Fig. 2

Kaplan–Meier curves for 28-day all-cause mortality based on HFNC usage in paired cohort. In the multivariable Cox proportional hazards model, adjustments were made for cerebrovascular disease, congestive heart failure, chronic lung disease, renal disease, diabetes mellitus with complications, diabetes without complications, 24-h vasopressor use, 24-h mechanical ventilation, mean hemoglobin, mean PH, and mean lactate levels. CI, confidence interval; HFNC, High-flow nasal cannula