Fig. 1.—
Total haem oxygenase‐1 (HO‐1) expression. Semi-quantitative total score of HO-1 expression on alveolar macrophages in bronchoalveolar lavage fluid for exsmoking chronic obstructive pulmonary disease patients (○) and age-matched healthy exsmoking controls (□). The horizontal line represents the median.#: p=0.018.