CRP and COVID-19: The percentage of neutrophils, CRP, ferritin, age, and scoring index of chest x-ray showed strong and significant correlations with COVID-19 severity (mild and moderate; r values of 0.33, 0.40, 0.43, 0.44, and 0.52, respectively; all P<.001), and their RR values for the cutoff50 values were significantly higher than the pooled RR (RR values of 3.18, 3.4, 3.62, 4.19, and 3.29, respectively; all P<.001).