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