Fig. 5

Associations of the salivary microbiotas with duration of HD and CPI index. Correlations were detected, and the indices with Spearman’s correlation (|correlation ρ| coefficients > 0.3 or 0.4, P < 0.05) were visualized in Cytoscape. If the correlations are negative, the connecting line is blue; if the correlation is positive, the connecting line is red. The line thickness represents the size of the correlation coefficient