Fig. 6From: Analysis of sputum microbial metagenome in COPD based on exacerbation frequency and lung function: a case control studyCorrelation between relative abundance of the microbiome and clinical variables. a Bifidobacterium and Bifidobacterium dentium had a positive correlation with FEV1/pre (r = 0.325 or 0.331); b A total of 29 bacterial genera and species showed a negative correlation with the frequency of exacerbation (r ranged from − 0.463 to − 0.334)Back to article page