Table 3.

Relationship between dose volume histogram parameters and incidence of grade 2 pneumonitis

	Grade ≥ 2 pneumonitis (n = 4) mean ± SD	Grade < 2 pneumonitis (n = 15) mean ± SD	P
MLD	9.6 ± 4.3	5.4 ± 1.7	0.141
Lung V5	24.7 ± 9.5	14.4 ± 3.3	0.118
Lung V10	21.9 ± 8.4	12.3 ± 3.2	0.104
Lung V15	19.8 ± 7.6	10.9 ± 3.2	0.097
Lung V20	18.0 ± 6.9	9.7 ± 3.1	0.093
Lung V25	16.0 ± 5.9	8.7 ± 3.0	0.085
Lung V30	14.2 ± 5.3	7.8 ± 2.9	0.092

MLD, mean lung dose; SD, standard deviation.