Actual Anatomical and Dosimetric Changes of Parotid Glands in Nasopharyngeal Carcinoma Patients during Intensity Modulated Radiation Therapy

Table 3

Variations of parotid volumes among different fractions (pairwise comparisons).

Fraction number		Average volume variation (cm^3)
1	6	−0.84	0.023
6	11	−1.3	0.000
11	16	−1.86	0.000
16	21	−1.37	0.000
21	26	−0.99	0.002
26	31	−0.75	0.02
31	33	−0.58	0.447