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Table 4 Optimal cut-off values for and crude rates of Grade 3 radiation dermatitis

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

  Cut-off value Grade 3 radiation dermatitis < Cut-off > Cut-off P-value
V5Gy (cm3) 690 5/40 (12.5%) 21/61 (34.4%) 0.019
V10Gy (cm3) 565 5/40 (12.5%) 21/61 (34.4%) 0.019
V20Gy (cm3) 400 9/66 (13.6%) 17/35 (48.6%) < 0.01
V30Gy (cm3) 190 2/38 (5.3%) 24/63 (38.1%) < 0.01
V40Gy (cm3) 115 2/34 (5.9%) 24/67 (35.8%) < 0.01
V50Gy (cm3) 85 8/54 (14.8%) 18/47 (38.3%) 0.011
V60Gy (cm3) 38 6/55 (10.9%) 20/46 (43.4%) < 0.01 a
  1. Abbreviations: VxxGy volume of the skin that received xx Gy
  2. aV60Gy was the most significant dose parameter in both LRA and RPA