Fig. 3.

Baseline Se status in relation to SARS-COV-2 IgG titres. (A) Serum Se was categorized into tertiles (Q1; <70.8 μg/L, Q2; <82.7 μg/L, and Q3; >82.7 μg/L), and no significant differences were observed between these groups. (B) Serum SELENOP was divided into tertiles (Q1; <3.6 mg/L, Q2; <4.3 mg/L, and Q3; <4.3 mg/L). A significant U-shaped difference was observed at the second time point (p = 0.023). However, this observation was not retained in the follow-up. (C) Serum GPx3 activity was classified into tertiles (Q1; <215.3 (U/L), Q2; <248.0 (U/L) and Q3; >248.0 (U/L)), and no differences in immune response were noted across the tertiles of GPx3 activity. Two-sided Kruskal-Wallis test was used to assess differences.