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Table 6 Kruskal-Wallis reveals a statistically significant difference of mouth opening among TMD groups.

From: Signs and Symptoms of Temporomandibular Joint Disorders Related to the Degree of Mouth Opening and Hearing Loss

Test Statisticsa,b
  Mouth opening
Chi-square 12.368
D 3
Asymp. Sig. .004
  1. a. Kruskal Wallis Test
  2. b. Grouping Variable: TMD