Specifically, as illustrated in Figure 3, COVID-19 patients demonstrated significantly higher median IL-6 expression levels [120 pg/mL; IQR 119.00–121.00] compared to the control group, which showed a much lower median IL-6 expression of 10 pg/mL, with the IQR (excluding outliers) ranging from 9.00 to 12.00. Here, IL6 is linked to COVID-19.