Table 3.

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

	Overall	Grade 0–2	Grade 3	P value
	Small bowel loops
	Mean volume ± SE (ml)
V5	385 ± 14	361 ± 14	542 ± 41	<0.001
V10	368 ± 14	344 ± 13	525 ± 39	<0.001
V15	357 ± 13	333 ± 13	514 ± 37	<0.001
V20	346 ± 13	321 ± 12	504 ± 36	<0.001
V30	304 ± 11	280 ± 11	464 ± 29	<0.001
V40	260 ± 11	234 ± 10	429 ± 28	<0.001
V45	242 ± 11	215 ± 12	413 ± 28	<0.001
	Mean dose (Gy ± SE)
	36.6 ± 0.5	35.9 ± 0.5	40.7 ± 1.3	<0.01
	gEUD (n = 0.15)
	45.7 ± 0.3	45.4 ± 0.3	47.9 ± 0.5	<0.001
	Large bowel loop
	Mean volume ± SE (ml)
V5	287 ± 12	286 ± 13	294 ± 36	0.96
V10	265 ± 11	265 ± 12	270 ± 33	0.91
V15	253 ± 11	253 ± 11	258 ± 31	0.96
V20	240 ± 10	239 ± 11	248 ± 30	0.91
V30	194 ± 8	193 ± 9	205 ± 22	0.58
V40	161 ± 8	160 ± 9	166 ± 16	0.36
V45	149 ± 8	148 ± 9	156 ± 15	0.28
	Mean dose (Gy ± SE)
	29.8 ± 0.5	29.9 ± 0.5	29.0 ± 1.4	0.38
	gEUD (n = 0.15)
	43.7 ± 0.2	43.6 ± 0.3	44.1 ± 0.4	0.76
	Bowel bag
	Mean volume ± SE (ml)
V5	1320 ± 31	1305 ± 34	1416 ± 72	0.14
V10	1254 ± 29	1238 ± 32	1356 ± 68	0.11
V15	1215 ± 28	1199 ± 30	1322 ± 65	0.10
V20	1175 ± 26	1157 ± 28	1292 ± 63	0.06
V30	1031 ± 21	1009 ± 22	1177 ± 56	0.01
V40	898 ± 23	871 ± 24	1070 ± 58	<0.01
V45	840 ± 25	811 ± 26	1027 ± 59	<0.01
	Mean dose (Gy ± SE)
	35.8 ± 0.3	35.5 ± 0.3	37.8 ± 1.0	0.04
	gEUD (n = 0.15)
	45.9 ± 0.2	45.7 ± 0.2	47.1 ± 0.3	<0.01

DVH = dose–volume histogram, GI = gastrointestinal, SE = standard error, gEUD = the generalized equivalent uniform dose.