CRP and COVID-19: Compared with mild COVID-19 patients, severe patients showed raised values of NLR (OR 1.21, P <0.001), PLR (OR 1.01, P <0.001), LMR (OR 0.63, P <0.001), CLR (OR 1.01, P <0.001), PCT (OR 1.09, P =0.01) and CRP (OR 1.02, P <0.001) (Table 3).