IL6 and COVID-19: IL-6 values, similar to HGF, showed significant increases among the three severity groups only for females (p < 0.0001), but with more prominent differences as the total levels varied from 2.64 pg/mL [95% CI 0.68-4.61] in mild cases to 18.78 pg/mL [95% CI 7.37-30.19] in moderate, and 46.26 pg/mL [95% CI 26.52-65.99] in severe COVID-19 patients (Figure 1H).