highly significantp < 0.001
Relative elasticity of the subgroups The cumulated paired subgroup analysis with the Kruskal–Wallis test showed a highly significant difference for the clinical evaluation of tissue swelling between the control group and the subgroups grade 2 and 3 (moderate and severe soft-tissue swelling, p < 0.001), whereas the difference was less emphasized but still significant for the subgroup grade 1 (light tissue swelling, p < 0.02).