CRP and COVID-19: We also observed significantly lower levels of ferritin and IL-6 between COVID-19 patients with various HOMA-IR (167.0 [105.0–526.0] vs. 474.0 [231.2–834.5] μg/l, p = 0.04 and 1.50 [1.50–3.26] vs. 5.19 [1.50–10.45] pg/ml, p = 0.01; respectively), although levels of other APPs (CRP, PCT) did not differ between these two subgroups.