| IMRT ± SD | 3DCRT ± SD | P-value |
V25 (%) | 37.16 ± 13.44 | 44.94 ± 21.45 | 0.086 |
V40 (%) | 25.57 ± 9.69 | 34.30 ± 15.96 | 0.021 |
V60 (%) | 14.38 ± 5.22 | 23.78 ± 12.18 | 0.021 |
V70 (%) | 9.27 ± 4.39 | 17.48 ± 8.20 | 0.028 |