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Comparison of antioxidant parameters between study groups by paired samples test. Case group included patients who received Vitamin E and control group included patients who received placebo. The difference of the trend of parameters were not significantly different between study groups for total antioxidant capacity (a, P = 0.44), catalase (b, P = 0.25), glutathione (c, P = 0.79), and was significantly different for malondialdehyde (d, P = 0.003)
