| IMRT ± SD | 3DCRT ± SD | P-value |
V25 (%) | 39.4 ± 11.17 | 39.4 ± 14.6 | 0.477 |
V40 (%) | 24.83 ± 6.8 | 23.97 ± 8.97 | 0.593 |
V60 (%) | 12.22 ± 3.12 | 15.44 ± 7.43 | 0.214 |
V70 (%) | 5.83 ± 1.85 | 12.03 ± 6.49 | 0.008 |