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)
8 (25.0%)
0 (0.0%)
4.584
0.000
Mild (G2)
15 (46.9%)
4 (12.1%)
Moderate (G3)
6 (18.7%)
19 (57.6%)
Severe (G4)
3 (9.4%)
10 (30.3%)