Table 2.

Influence factors of radiation pneumonitis by logistic regression analysis

Factor	B	SE	Wald	P
KPS score	0.032	0.023	1.966	0.161
COPD	0.632	0.958	0.435	0.509
Concurrent chemoradiotherapy	-1.978	0.834	5.634	0.018
GTV dose	-0.155	0.051	9.308	0.002
V20	-0.422	0.104	16.418	0.000
MLD	0.109	0.138	0.629	0.428
PTV	-0.56	0.017	10.877	0.001

KSP, Karnofsky performance status; COPD, chronic obstructive pulmonary disease; GTV, gross tumor volume; MLD, mean lung dose; PTV, planning target volume.