Fig. 3

Percentage of patients with severe COVID-19 pneumonia reaching a composite endpoint. The composite endpoint was defined as needing invasive mechanical ventilation or death in the 30 days after randomization. Hazard ratio was 0.23 (95% CI, 0.05 to 0.96; P < 0.05). Patients with severe COVID-19 pneumonia were receiving low-flow supplemental oxygen (arm A)