From: Clinical observation of submandibular gland transfer for the prevention of xerostomia after radiotherapy for nasopharyngeal carcinoma: a prospective randomized controlled study of 32 cases
Degree of xerostomia
Experimental group
Control group
Z-value
P-value
None (G1)
7 (26.9%)
0 (0.0%)
4.423
0.000
Mild (G2)
15 (57.7%)
6 (23.1%)
Moderate (G3)
3 (11.5%)
16 (61.5%)
Severe (G4)
1 (3.9%)
4 (15.4%)