Fig. 1From: Clinical characteristics of airway impairment assessed by impulse oscillometry in patients with chronic obstructive pulmonary disease: findings from the ECOPD study in ChinamMRC and CAT scores between airway impairment group and non-airway impairment group in patients with chronic obstruction pulmonary disease, datas were shown as mean (SE) ** means < 0.01, *** means < 0.001Back to article page