WHO Ordinal Scale, PF and laboratory markers
Values of PF and WHO Covid Outcome Ordinal Scale (COOS) were measured throughout the study. Laboratory markers, viz., IL-6, CRP, D-Dimer, and S. Ferritin values and NLR ratio were recorded daily, or as and when conducted as per the institutional protocol, which sometimes varied from patient to patient. Further, the laboratory markers were not available till the 28