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. 2020 Sep 3;15:2071–2079. doi: 10.2147/COPD.S266612

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© 2020 Zhou et al.

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Mean ranks of natural log-transformed values of each bacterial species between COPD case and control groups.

Note: Since the log-transformed values of each bacterial species were abnormally distributed, Wilcoxon signed rank sum test was used to compare the median difference between case and control groups (n=60 in each group, all P >0.05).

Abbreviations: COPD, chronic obstructive pulmonary disease; Pg, Porphyromonas gingivalis; Aa, Actinobacillus actinomycetemcomitans; Pi, Prevotella intermedia; Tf, Tannerella forsythensis; Td, Treponema denticola; Pa, Pseudomonas aeruginosa; Sp, Streptococcus pneumonia; Hi, Haemophilus influenza; Kp, Klebsiella pneumonia.