Table 2.

Mean absolute dose deviation (MADD) by structure and setup.

	MADD supine, PoDP	MADD prone, PoDP	Δ MADD prone–supine, PoDP	P-value
Heart
Mean (SD)	1.4 (0.4)	2.0 (0.5)	0.6 (0.5)	< 0.001
Median (Range)	1.3 (0.6, 2.7)	1.9 (0.8, 4.2)	0.5 (− 0.8, 2.6)
Contralateral lung
Mean (SD)	0.5 (0.2)	0.6 (0.2)	0.1 (0.2)	< 0.001
Median (Range)	0.5 (0.2, 1.4)	0.6 (0.2, 1.5)	0.1 (− 0.9, 1.2)
Ipsilateral lung
Mean (SD)	9.6 (3.7)	2.8 (1.6)	− 6.8 (3.6)	< 0.001
Median (Range)	9.3 (2.2, 24.7)	2.3 (0.6, 8.5)	− 6.3 (− 22.2, 0.6)
Contralateral breast
Mean (SD)	0.8 (0.6)	1.7 (1.4)	0.9 (1.4)	< 0.001
Median (Range)	0.7 (0.1, 6.4)	1.5 (0.3, 16.6)	0.8 (− 4.5, 15.5)
Ipsilateral breast
Mean (SD)	2.6 (0.9)	2.7 (0.7)	0.2 (0.9)	0.045
Median (Range)	2.4 (1.3, 6.9)	2.5 (1.6, 5.3)	0.2 (− 3.7, 3.0)
Tumor bed
Mean (SD)	2.0 (1.2)	2.2 (1.7)	0.2 (2.0)	0.259
Median (Range)	1.8 (0.3, 8.2)	1.8 (0.3, 12.6)	0.1 (− 6.1, 10.5)

PoDP percent of dose prescribed.