Table 3.

The relationship between the dose volume histogram parameters and the incidence of grade 3–5 pneumonitis

	Grade ≥3 pneumonitis (n = 2)	Grade ≤2 pneumonitis (n = 14)	p value
	mean ± SD	mean ± SD
MLD	7.4 ± 4.5	5.0 ± 2.6	0.333
Lung V5	16.5 ± 9.3	12.3 ± 5.3	0.417
Lung V10	14.6 ± 8.8	10.8 ± 4.9	0.500
Lung V15	13.4 ± 8.2	9.7 ± 4.6	0.417
Lung V20	12.4 ± 7.8	8.8 ± 4.3	0.333
Lung V25	11.6 ± 7.3	8.0 ± 4.0	0.333
Lung V30	10.8 ± 6.9	7.3 ± 3.8	0.333

Abbreviations: MLD mean lung dose, SD standard deviation