Fig. 3
Analysis of subgroups for 28-day all-cause mortality in the matched cohort. The multivariable Cox proportional hazards model employed in this study incorporated adjustments for a range of factors. These factors included cerebrovascular disease, congestive heart failure, chronic lung disease, renal disease, diabetic complications, diabetes without complications, 24-h vasopressor use, 24-h mechanical ventilation, as well as mean hemoglobin, mean pH, and mean lactate levels. CI, confidence interval; HFNC, High-flow nasal cannula; HR, hazard ratio; SOFA, Sequential Organ Failure Assessment; PaO2/FiO2, arterial blood oxygenation index