Table 8.

Significant p-values using Mann–Whitney U test (comparing parameters for organs at risk sparing as given in Table 7)

Variables/comparisons	Comparisons
	Conv vs FIF	Conv vs HT-IMRT	Conv vs TD-3DCRT	Conv vs TD-IMRT
Total lung
Mean	1.000	0.004	0.009	0.004
V40	0.394	0.002	0.240	0.093
V30	0.310	0.002	0.132	0.065
V20	0.286	0.004	0.041	0.015
V10	0.699	0.041	0.002	0.002
Heart
V5	0.009	0.015	0.015	0.009

3DCRT, three-dimensional conformal radiotherapy; conv, conventional; FIF, field in field; HT, helical tomotherapy; IMRT, intensity-modulated radiotherapy; TD, TomoDirect™ (Accuray Inc., Sunnyvale, CA); V_x, volume of OAR receiving at least x Gy.

Significant p-values are shown in bold.