Table 2 Comparison of the dose to the brainstem according to treatment group. V15 and V17 = volume of brainstem receiving more than 15 Gy and 17 Gy, in cc. Dmax = dose received by 0.035 cc of the brainstem (D0.035)

Dmax (mean)

12.6 Gy

21.3 Gy

17.3 Gy

p < 0.001

Dmax (median)

13.3 Gy

20.4 Gy

15.0 Gy

[Min–max]

[5.3–16.6]

[10.8–31.5]

[5.3–31.5]

V15 (mean)

0.021 Gy

0.108 Gy

0.068 Gy

p < 0.001

[Min–max]

[0.000–0.057]

[0.004–0.231]

[0.000–0.231]

V27 (mean)

0.002 Gy

0.020 Gy

0.012 Gy

p < 0.001

[Min–max]

[0.000–0.010]

[0.000–0.057]

[0–0.057]