Identifying risk factors for L’Hermitte’s sign after IMRT for head and neck cancer

Radiation Oncology

Table 2 Univariate analysis of SC Dose parameters and LS incidence

	Non-LS (n = 75)	LS (n = 42)	Difference (95% CI)	p value (2-tailed)
D_max	36.4 ± 4.7	36.6 ± 5.3	0.27 (−1.6–2.1)	0.8^a
D_2cc	33.1 ± 4.8	33.0 ± 5.6	0.10 (− 1.9–2.1)	0.9^a
D_mean	29.4 ± 5.4	28.4 ± 4.9	1.0 (−0.9–2.9)	0.3^a
HI	0.48 ± 0.27	0.57 ± 0.22	0.093 (0.002–0.2)	0.05^a
V_10Gy	14.3 ± 3.3	14.0 ± 2.9	0.35 (− 0.8–1.5)	0.6^a
V_20Gy	12.4 ± 3.7	11.5 ± 3.4	0.90 (− 0.4–2.2)	0.3^a
V_30Gy	7.6 (1.9–11.3)	4.9 (1.6–8.5)	2.7 (− 0.3–5.7)	0.1^b
V_40Gy	0 (0–0.03)	0 (0–0.15)	0 (0–0)	0.9^b
V_10%	100 (100–100)	100 (100–100)	0 (0–0)	0.7^b
V_20%	99.5 (91.2–100)	96.4 (79.9–99.3)	3.1 (− 1.1–7.4)	0.02^b
V_30%	61.60(14.5–86.8)	41.6 (13.9–70.6)	20 (−2–41)	0.1^b
V_40%	0 (0–0.19)	0 (0–1.16)	0 (0–0)	0.9^b

Abbreviations: CI – confidence interval, HI- homogeneity index ^aMean ± SD and Student’s t test, ^bMedian, Interquartile range and Mann Whitney U test

ISSN: 1748-717X