We added this information also in Table 3. We analysed FiO2 (depending on the method of oxygen delivery - nasal canulae, HNF, MV), as you suggested and the cut-off value of FiO2 corresponded to the cut-off for the oxygen flow rate, so the two groups in Table 3 would be similar.
The impact of Tocilizumab on radiological changes can not be adequately analyzed without a control group not receiving the drug.