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Table 3 Comparisons of skin dose parameters among patients with Grades 1–3 dermatitis

From: A scoring system predicting acute radiation dermatitis in patients with head and neck cancer treated with intensity-modulated radiotherapy

Skin (mean ± SD) Grade 1 Grade 2 Grade 3 P-value
V5 Gy (cm3) 566 ± 224 693 ± 136 745 ± 85 < 0.01
V10 Gy (cm3) 438 ± 197 568 ± 119 620 ± 81 < 0.01
V20 Gy (cm3) 262 ± 128 365 ± 92 410 ± 73 < 0.01
V30 Gy (cm3) 152 ± 75 216 ± 68 247 ± 48 < 0.01
V40 Gy (cm3) 96 ± 45 133 ± 47 149 ± 28 < 0.01
V50 Gy (cm3) 59 ± 30 83 ± 33 95 ± 24 < 0.01
V60 Gy (cm3) 25 ± 17 40 ± 22 49 ± 16 < 0.01
  1. Abbreviations: SD standard deviation, VdGy volume of the skin that received more than the threshold dose of d Gy
  2. P-value: derived by Mann–Whitney U-test comparisons between Grades 1–2 and Grade 3 patients