Analysis plan
ARF
ARF
We classified intubation time as 1) very early: before or at ICU admission; 2) early: < 24 h after ICU admission, 3) late: > 24 h after ICU admission and 4) never intubated. We compared early versus late groups. We first displayed the clinical characteristics of the patients using the very early group as a reference group since these group patients showed clear signs of ARF and emergency orotracheal intubation. Therefore, our main analysis will focus on patients who were intubated within the first 24 h of ICU admission compared to those who were intubated after this time period.