Fig. 3From: Awake prone position in COVID-19-related acute respiratory failure: a meta-analysis of randomized controlled trialsSubgroup analysis of intubation. A. ICU vs. non-ICU, B. APP ≤ 4 h vs. > 4 h, C. Average baseline SpO2 to FiO2 ratio < 200 vs. ≥ 200Back to article page