Fig. 4

Linear regression analysis between interleukin-6 (IL-6, a-c) or interleukin-10 (IL-10, d-f) and serum malondialdehyde (a, d), erythrocyte glutathione S-transferase (b, e), erythrocyte glutathione reductase (c, f) in patients affected by COVID-19 included in the study