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. 2021 Jan 30;165:184–190. doi: 10.1016/j.freeradbiomed.2021.01.044

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Fig. 1 — Classification of parameters of oxidative stress in patients with COVID-19 based on the severity of the disease (moderate, n = 33; severe, n = 44). (A) H₂O₂, (B) TAC, (C) GST, (D) GSH, (E) GSSG, (F) GSH:GSSG ratio, (G) MDA, (H) carbonyl, and (I) sulfhydryl. Data are expressed as median (minimum and maximum) ± standard deviation and analyzed using the student's t-test or Mann-Whitney U test when appropriate. The differences were considered to be significant at p < 0.05. SPSS v23.0 (IBM, Chicago, IL) and GraphPad Prism v7 (GraphPad, San Diego, CA) softwares were used for the statistical analyses. H₂O₂, hydrogen peroxide; TAC, total antioxidant capacity; GST, glutathione S-transferase; GSH, glutathione reduced; GSSG, glutathione dissulfide; MDA, malondealdehyde.