Table 4.

Univariate analysis of continuous variables in 811 patients with radiation pneumonitis.

Variables		RP	nRP1	t/U*	P
Age		52.88 ± 9.07	52.58 ± 9.56	0.183	0.855
PTV volume		568.97 ± 236.24	540.82 ± 209.54	0.766	0.444
Chemotherapy cycles*		8 (7∼8)	6 (6∼7)	7072.500	<0.001
Ipsilateral lung	MLD2(Gy)	13.40 ± 0.80	10.41 ± 1.56	22.208	<0.001
	V5(%)	55.21 ± 3.29	45.80 ± 7.08	16.878	<0.001
	V10(%)	37.10 ± 2.56	29.20 ± 5.32	17.978	<0.001
	V20(%)	23.84 ± 2.12	17.44 ± 3.64	17.809	<0.001

¹nRP, non-RP; ²MLD, mean lung dose; ^*U, The Mann-Whitney U test.