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Table 2 Univariate analysis of SC Dose parameters and LS incidence

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

  Non-LS (n = 75) LS (n = 42) Difference (95% CI) p value (2-tailed)
Dmax 36.4 ± 4.7 36.6 ± 5.3 0.27 (−1.6–2.1) 0.8a
D2cc 33.1 ± 4.8 33.0 ± 5.6 0.10 (− 1.9–2.1) 0.9a
Dmean 29.4 ± 5.4 28.4 ± 4.9 1.0 (−0.9–2.9) 0.3a
HI 0.48 ± 0.27 0.57 ± 0.22 0.093 (0.002–0.2) 0.05a
V10Gy 14.3 ± 3.3 14.0 ± 2.9 0.35 (− 0.8–1.5) 0.6a
V20Gy 12.4 ± 3.7 11.5 ± 3.4 0.90 (− 0.4–2.2) 0.3a
V30Gy 7.6 (1.9–11.3) 4.9 (1.6–8.5) 2.7 (− 0.3–5.7) 0.1b
V40Gy 0 (0–0.03) 0 (0–0.15) 0 (0–0) 0.9b
V10% 100 (100–100) 100 (100–100) 0 (0–0) 0.7b
V20% 99.5 (91.2–100) 96.4 (79.9–99.3) 3.1 (− 1.1–7.4) 0.02b
V30% 61.60(14.5–86.8) 41.6 (13.9–70.6) 20 (−2–41) 0.1b
V40% 0 (0–0.19) 0 (0–1.16) 0 (0–0) 0.9b
  1. Abbreviations: CI – confidence interval, HI- homogeneity index aMean ± SD and Student’s t test, bMedian, Interquartile range and Mann Whitney U test