CRP and COVID-19: ∆NLR: Delta neutrophil-lymphocyte ratio or change in neutrophil-lymphocyte ratio, SC-19: severe COVID-19, NSC-19: not severe COVID-19, BP: blood pressure, SpO2: oxygen saturation, HbA1c: glycosylated hemoglobin, NLR: neutrophil-lymphocyte ratio, CRP: C-reactive protein, LDH: lactate dehydrogenase