Figure 4. Identification of biomarker’s taxa. (A) LefSe determined 14 floras at genus levels were markedly enriched in the COPD group. (B) Wilcoxon rank-sum test showed the abundance of 5 floras was significantly increased in COPD group among 14 floras. (C) The ROC of 5 biomarker’s taxa. LefSe: The Linear discriminant analysis (LDA) effect size; ROC: The receiver operating characteristic curve; AUC, the area under the ROC.