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Box plots showing distribution of (A) Shuttle Walk Test (SWT) distance and (B) St George's Respiratory Questionnaire (SGRQ) score, by iron status in the chronic obstructive pulmonary disease (COPD) cohort. SWT distance was lower in the iron-deficient (ID) group (median 165 vs 240 m, p=0.035) although statistical significance was lost after correction for difference in FEV1 (p=0.081). The difference in SGRQ scores was not statistically significant (mean 33.5 vs 30.1, p=0.056).
