Fig. 1From: Relationship between gut microbiota and lung function decline in patients with chronic obstructive pulmonary disease: a 1-year follow-up studyThe alteration of lung function parameters in each COPD patient. A pre-bronchodilator; B post-bronchodilator. *p < 0.05, paired t test; stage 1: lung function measurement, first time; stage 2: lung function measurement, 1-year after stage 1Back to article page