Furthermore, the mean level of P-selectin in the mild COVID-19 group is 55.46 ± 42.21 ng/mL, in the moderate COVID-19 group is 69.02 ± 57.06 ng/mL, and in the severe COVID-19 group is 37.03 ± 34.60 ng/mL (Table 3). Here, SELP is linked to COVID-19.