Fig 4.

Forest plot for subgroup analysis of awake prone positioning compared with usual care for endotracheal intubation in patients with hypoxemic respiratory failure due to covid-19 according to median baseline oxygen saturation to fraction of inspired oxygen (SpO₂:FiO₂). Two trials had no intubation events in both arms (Taylor, Kharat) and three trials did not report the baseline SpO₂:FiO₂ (Johnson, Hashemian, Qian) and were excluded from this analysis. One trial reported baseline arterial oxygen tension to fraction of inspired oxygen (PaO₂:FiO₂), which was converted to SpO₂:FiO₂. APP=awake prone positioning