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Table 5 Mann- Whitney test shows a statistically significant difference of mouth opening between non-TMD and TMD subjects.

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

Test Statisticsa
  Mouth opening
Mann-Whitney U 5361.000
Wilcoxon W 9894.000
Z -2.874
Asymp. Sig. (2-tailed) 0.005
  1. a. Grouping Variable: TMD vs non-TMD