Fig. 5

Low serum concentrations of 25(OH)D are correlated with anemia, microinflammation and oxidative stress in patients with PD. The cut off was set by ROC analysis and concentrations of hemoglobin (A), RBC (B), TIBC (C), hs-CRP (D), IL-6 (E), TNF-α (F), MDA (G), SOD (H), and GSH-Px (I) were compared between high 25(OH)D concentration (> 17.93 ng/mL, n = 26) and low 25(OH)D concentration (< 17.93 ng/mL, n = 36). Violin plot was used to show the data. *p < 0.05, **p < 0.01, ***p < 0.001, Mann–Whitney test