SOD1 and hematocrit: SOD and GPx activities in blood erythrocytes as well as GSH and TAC plasma concentrations (Figure 2) in HT patients were significantly lower than the discussed parameters in the erythrocytes and plasma of the control group (↓50%, p = 0.009; ↓45%, p = 0.00001; ↓13%, p = 0.001; ↓82%, p = 0.00001, respectively) (Figure 1).