Fig. 1
From: Early intubation and decreased in-hospital mortality in patients with coronavirus disease 2019
Patient flow diagram. Among 4700 patients with coronavirus disease (COVID-19) in the J-RECOVER database, 412 adult patients were intubated after hospital admission and were therefore eligible for this study. A total of 110 (26.7%) patients underwent early intubation for whom ≤ 6 L/min of oxygen was administered immediately before intubation. Eighteen patients in the early intubation group and 39 patients in the non-early intubation group were excluded from inverse probability weighting (IPW) analyses due to missing covariates for propensity score calculation; hence, IPW analyses were performed for 355 patients