Severity of respiratory failure at admission and in-hospital mortality in patients with COVID-19: a prospective observational multicentre study

Italian study (n=412) concluded moderate-to-severe impairment in partial pressure of oxygen to fraction of inspired oxygen ratio (PaO2/FiO2: moderate 101–200 mm Hg; severe <100 mm Hg) was independently associated with a threefold increase in risk of in-hospital mortality.

BMJ Open