Quality of Life and Long-term Outcomes After Hospitalization for COVID-19

Disease severity characterized by the highest six-level ordinal scale during the hospital stay, which consists of the following categories: a score of 1 indicated not hospitalized; 2, hospitalized and not receiving supplemental oxygen; 3, hospitalized and receiving supplemental oxygen; 4, hospitalized and receiving oxygen supplementation administered by a high-flow nasal cannula or noninvasive ventilation; 5, hospitalized and receiving mechanical ventilation; and 6, death