[Retracted] Research Value of Intensity Modulated Radiation Therapy in Alleviating Parotid Gland Function Injury in Patients with Stage N0 Nasopharyngeal Carcinoma from Physical and Dosimetric Aspects

Table 5

Comparison of xerostomia grading after radiotherapy.

Classification	At the end of radiotherapy		12 months after radiotherapy
	3D-CRT group ()	IMRT group ()	3D-CRT group ()	IMRT group ()
0	0 (0.0)	0 (0.0)	10 (28.6)	16 (38.1)
1	13 (37.1)	18 (42.9)	10 (28.6)	19 (45.2)
2	22 (62.9)	24 (57.1)	15 (42.9)	7 (16.7)
3	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)
χ^2	0.2592		6.4262
P	0.6107		0.0402