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Table 3 Mean of electric activity (in μV) of the masseter, submental-submandibular and infrahyoid muscle groups covered by the platysma during a continuous drinking test of 100 cc of water.

From: Oynophagia in patients after dental extraction: surface electromyography study

  Control group Dental patients
M. masseter
   Raw mean* 6.122 7.359
   SD 2.310 2.514
   Real mean** 3.627 4.864
The submental-submandibular muscle group
   Raw mean 10.238 12.658
   SD 2.174 3.186
   Real mean 7.430 9.850
The infrahyoid group
   Raw mean 6.012 5.884
   SD 1.696 1.935
   Real mean 3.204 3.076
  1. *Raw mean = computer-calculated mean
  2. **Real mean = raw mean minus the mean resting potential of an actual muscle covered by skin (2.808 μV = for the m. submental and m. infrahyoid, 2.495 μV = for the m. masseter, and 4.542 = for the m. orbicularis oris).