Fig. 2

Time to event curves using Kaplan-Meier with multivariate Cox regression. The probability of been intubated in the original (top-left) and weighted (top-right) samples and the probability of 28-day mortality in the original (bottom-left) and weighted (bottom-right) samples were not affected by the use of awake prone positioning. HFNO, high-flow nasal oxygen therapy; HFNO + awake-PP, high-flow nasal oxygen therapy plus awake prone positioning