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Changes in the acute respiratory distress syndrome (ARDS) severity of the control and pulse steroid groups, which include patients with critical or severe coronavirus disease 2019 (COVID-19) cases. ARDS severity was adopted from the Berlin definition [16]: severe, PF ratio ≤100; moderate, 100< PF ratio ≤200; mild, 200< PF ratio ≤300. PF ratio, partial pressure of oxygen in arterial blood/fraction of inspired oxygen ratio.
