. Author manuscript; available in PMC: 2013 Aug 1.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2012 Jan 26;83(5):1528–1533. doi: 10.1016/j.ijrobp.2011.10.052

Table 3.

Comparison of Dose Metrics by LS Status: Anatomical Spinal Cord^*

Dose metric	Non-LS (n = 34)	LS (n = 15)	p-value
Mean dose (Gy)	26.3 ± 6.4	30.2 ± 6.3	0.039
Maximum dose (Gy)	42.9 ± 3.9	44.0 ± 4.6	0.327
V₁₀ (%)	88.1 ± 7.8	89.1 ± 7.3	0.259
V₂₀ (%)	71.9 ± 20.4	76.8 ± 17.0	0.204
V₃₀ (%)	45.0 ± 29.7	64.6 ± 27.6	0.037
V₄₀ (%)	10.6 ± 15.3	27.2 ± 20.0	0.007
Vol (cc) ≥10 Gy	16.8 ± 2.5	17.2 ± 2.4	0.293
Vol (cc) ≥20 Gy	13.6 ± 4.1	14.8 ± 3.7	0.160
Vol (cc) ≥30 Gy	8.4 ± 5.6	12.4 ± 5.7	0.031
Vol (cc) ≥40 Gy	1.8 ± 2.6	5.4 ± 4.3	0.005

Defined from the skull base to the superior border of the aortic arch.