Table 3.

Dosimetric parameters of organs at risk

Variable	Non-coplanar intensity-modulated radiotherapy plan	Stereotactic body radiotherapy plan	p-value
Lung
Mean lung dose (Gy)	5.6 ± 2.1a	6.9 ± 2.4	<0.001
V5 (%)	24.3 ± 9.0a	28.8 ± 9.6	<0.001
V10 (%)	16.2 ± 6.4a	18.7 ± 6.6	<0.001
V15 (%)	11.6 ± 4.8a	13.5 ± 5.1	0.001
V20 (%)	8.8 ± 3.8a	10.8 ± 4.6	<0.001
Spinal cord Dmax (Gy)	10.8 ± 7.4a	15.3 ± 8.6	0.002
Oesophageal Dmax (Gy)	18.1 ± 17.2a	22.3 ± 17.4	<0.001
Heart Dmax (Gy)	35.1 ± 29.1a	39.9 ± 30.1	<0.001
Heart Dmean (Gy)	3.6 ± 4.6a	5.2 ± 5.7	0.007

D_max, maximal dose; D_mean, mean dose; V₅, V₁₀, V₁₅, V₂₀, lung receiving a dose >5, 10, 15 and 20 Gy.

Parameters are calculated by Wilcoxon single-rank test.

^aSignificant difference.