Table 4.
Delivery dose characteristics between patients with xerostomia and patients without xerostomia
| Parameter | 1Ref | Patients with xerostomia (n = 8) | Patients without xerostomia (n = 13) | P value |
|---|---|---|---|---|
| 2V20 (%) | NA | 87.1 ± 6.7 | 64.7 ± 23.3 | <0.01 |
| V30 (%) | NA | 46.4 ± 8.2 | 33.1 ± 16.4 | 0.05 |
| V40 (%) | NA | 27.6 ± 6.9 | 19.3 ± 11.7 | 0.06 |
| 3D50 (Gy) | 30 | 29.3 ± 2.8 | 23.8 ± 6.2 | <0.01 |
| Dmean (Gy) | 26 | 33.6 ± 2.2 | 28.0 ± 6.5 | <0.01 |
1Ref = parotid radiation tolerance.
2V20 = the percentage of parotid gland volume that received 20 Gy in the total parotid gland.
3D50 = dose to the 50% of the parotid gland.