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. 2020 Feb 3;10:1652. doi: 10.1038/s41598-020-58585-4

Figure 1.

Figure 1

Median values (25%; 75% percentiles) of serum and salivary ET-1 levels in each group of subjects. *p < 0.05, **p < 0.01 and ***p < 0.001 significant differences vs. control subjects (derived by Kruskal Wallis test). §§p < 0.01 significant differences vs periodontitis patients. P < 0.001 (obtained by Jonckheere-Terpstra test).