From the Pearson correlation analysis (Figure 5B) between these four clinical features (LDH, lymphocyte (%), neutrophil count, and CRP) and the phenotypic characteristics (systolic pressure, diastolic pressure, temperature, heart rate, SpO2, age, and respiratory rate), we could observe that there was a significantly negative correlation between lymphocyte (%) and age (p < 0.05), which was consistent with the general pattern of COVID-19 patients. Here, CRP is linked to COVID-19.