Table 2. Serum antioxidant vitamins in PD patients and controls.

Median (25-75th percentile); PD, Parkinson's disease; NS, non-significant differences; Numbers with different letters in the same row are significantly different from the others.

¹⁾ Mann-Whitney U test between control and total PD patient groups.

²⁾ Kruskal-Wallis ANOVA followed by Dunn's post hoc test between control, early PD patient and advanced PD patient groups.