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Violin plots of absolute hepcidin-25 levels in serum of all COPD patient groups (A) and delta (post-pre) of serum hepcidin-25 levels in placebo and iron-treated groups (B). The dashed line represents the median and the dotted lines the interquartile ranges. Statistical significance: n.s., no significance; $$$ p < 0.001 between post-iron treatment and post-placebo treatment, *** p < 0.001 between post-iron and pre-iron treatment; ### p < 0.001 between iron and placebo treatment.
