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Walking test and CAT in COPD patients pre- and post-therapy with antioxidant drug. Walking test on COPD patients was performed at V1 and V2, after 6 months. Results are reported as distance in percentage of meters that patients quickly walked on a flat surface in 6 min *p-value < 0.05 Wilcoxon test (A). CAT score in COPD patients at V1 and V2, after 6 months. CAT values reported for individual patients. ***p-value = 0.001 Wilcoxon test (B).
