Fig. 2From: Association between annual change in FEV1 and comorbidities or impulse oscillometry in chronic obstructive pulmonary diseaseDistribution of annual change in FEV1 in patients with COPD. According to observation over 5 years, the annual change in FEV1 (mL) varied widely. The mean (SEM) was − 17.8 (4.0) mL/year (n = 65)Back to article page