Table 5: Average absolute volume ( 1σ) of normal tissue irradiated to at least 100% of the prescribed dose, VNormPI.

Group

m3 (cm3)

MLC-160 (cm3)

Δ( MLC_160 - m3) (cm3)

p-value

I

0.12 0.06

0.16 0.07

0.04

13.24 7.93

< 0.001

II

1.15 0.83

1.35 0.95

0.20

5.89 4.76

0.001

III

1.53 1.12

1.90 1.57

0.37

9.29 12.28

0.004

IV

2.02 1.72

2.85 2.79

0.83

20.18 16.93

< 0.001