Figure 1
From: Analysis of Endothelin-1 Concentrations in Individuals with Periodontitis
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).
