Fig. 3From: Phenotypic comparison between smoking and non-smoking chronic obstructive pulmonary diseaseInflammatory cell counts in induced sputum from healthy controls (n = 27, ●), smoking (S)-COPD (n = 34, ■) and non-smoking (NS)-COPD (n = 37, △). Data are presented as individual data points and bars indicate median and interquartile ranges, * = p < 0.05, **p < 0.01Back to article page