Fig. 6From: Characteristics of the sputum microbiome in COPD exacerbations and correlations between clinical indicesSpearman correlation between major sputum microbiome and clinical indices in COPD patients. a Heatmap of Spearman correlation analysis between the relative abundances of sputum microbiome and the clinical indices. *p < 0.05, **p < 0.01. b Veillonella shows a positive correlation with FEV1/FVC. c Staphylococcus shows a positive correlation with CRPBack to article page