The predicted prevalence of patients in each respiratory support state was estimated in the stack probability plot, comparing patients who were treated with tocilizumab from the OT state onwards (left plot) and patients who were not treated with tocilizumab during hospitalization (right plot).

Color code: black = death; blue = discharge; red = non-invasive ventilation/invasive mechanical ventilation; orange = oxygen therapy; green = no respiratory support. The strikethrough area refers to NRS or OT, whereas the “clean” areas refer to NRS or OT in recovery.