Fig. 2From: Evaluation of serum amino acids and non-enzymatic antioxidants in drug-naïve first-episode major depressive disorderVariations in serum levels of antioxidant vitamins (μmol/L) in the study population. Boxplot showing the median, maximum, and minimum value range. a Vitamin A, b Vitamin E, c Vitamin C are lower in the patient group. Mann-Whitney U test was performed to present p valuesBack to article page