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Table 4 Comparison of mean DVH parameters of the small bowel loops in patients with and without chronic GI complications (Mann–Whitney U test)

From: Dose-volume histogram predictors of chronic gastrointestinal complications after radical hysterectomy and postoperative intensity modulated radiotherapy for early-stage cervical cancer

  Overall Grade 0 Grade 1-2 P value
  Maximum dose (cGy ± SE)
  5600 ± 257 5552 ± 207 5697 ± 318 0.042
  Mean dose (cGy ± SE)
  2918 ± 500 2838 ± 448 3077 ± 568 0.080
  Mean ratio ± SE
V30 ratio 0.47 ± 0.14 0.46 ± 0.12 0.51 ± 0.17 0.301
V40 ratio 0.27 ± 0.12 0.24 ± 0.10 0.32 ± 0.15 0.011
V50 ratio 0.12 ± 0.08 0.11 ± 0.07 0.14 ± 0.08 0.134
  Mean volume ± SE (ml)
Total volume 1008 ± 399 1041 ± 366 943 ± 458 0.261
V30 volume 460 ± 185 466 ± 173 448 ± 211 0.507
V40 volume 257 ± 125 248 ± 119 275 ± 136 0.423
V50 volume 107 ± 62 101 ± 52 119 ± 77 0.451
  1. Abbreviations: DVH = dose-volume histogram; GI = gastrointestinal; SE = standard error; V30-50 volume = volume receiving more than respective dose; V30-50 ratio = volume receiving more than respective dose to total volume.