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Table 4 Mean total scores, Standard Deviation (SD) and Standard Error of the Mean (SEM) of xerostomia during meals and xerostomia in rest questionaires, for IMRT and Control groups.

From: Parotid gland sparing IMRT for head and neck cancer improves xerostomia related quality of life

   Xerostomia during meals Xerostomia in rest
  N Mean SD SEM Mean SD SEM
Total Group        
IMRT 75 7.2 5.7 0.7 7.6 5.0 0.6
Control 87 11.5 6.0 0.6 10.3 4.7 0.5
Oropharynx        
IMRT 28 9.1 6.1 1.2 7.0 5.2 1.0
Control 40 13.0 5.5 0.9 10.3 4.3 0.7
Larynx        
IMRT 23 4.3 4.4 0.9 7.1 3.9 0.8
Control 27 9.0 5.9 1.1 10.7 5.0 1.0
Other*        
IMRT 20 7.6 5.4 1.1 8.9 5.7 1.2
Control 24 12.1 6.4 1.4 9.6 5.1 1.1
  1. * hypopharynx, oral cavity, nasopharynx, thyroid