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Table 6 Cephalometric values of the upper airway for interethnic differences (Chinese versus Caucasian)

From: Cephalometric norms for the upper airway of 12-year-old Chinese children

Variables   Boys   Girls  
  Mean P value   Mean P value  
Soft palate       
PM-U Length of the soft palate -0.2 0.681   -0.1 0.954  
SPT Soft palate thickness 0.0 0.827   0.0 0.714  
NL/PM-U Inclination of the long axis of the soft palate relative to the nasal line 1.3 0.252   0.2 0.456  
Depth of upper airway       
PM-UPW Depth of the nasopharyngeal airway space 0.0 0.914   -0.2 0.738  
U-MPW Depth of the retropalatal pharyngeal airway space -0.4 0.146   0.1 0.724  
V-LPW Depth of the hypopharyngeal airway space 0.3 0.314   1.4 0.01 **
PASmin Depth of the retroglossal pharyngeal airway space 0.9 0.019 * 1.1 0.005 **
Position of the hyoid bone       
AH-FH Positon of the hyoid bone in the vertical plance 2.1 0.014 * 1.3 0.114  
AH-CV Positon of the hyoid bone in the horizontal plance 1.5 0.001 ** 0.9 0.074  
  1. *p < 0.05; **p < 0.01; ***p < 0.001.