Fig. 1From: Early prolonged prone position in noninvasively ventilated patients with SARS-CoV-2-related moderate-to-severe hypoxemic respiratory failure: clinical outcomes and mechanisms for treatment response in the PRO-NIV studyCumulative incidence of noninvasive ventilation (NIV) failure (A), death (B) and endotracheal intubation (C) in the prone position and control group at 28Â days after enrollment. In the endotracheal intubation group, patients with a Do-Not-Intubate (DNI) disposition were excludedBack to article page