Table 4.
Comparison of mean DVH parameters of the small bowel loops in patients with and without chronic GI complications (Mann–Whitney U test)
| Overall | Grade 0 | Grade 1-2 | Pvalue | |
|---|---|---|---|---|
| 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 |
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.