Table 3.

Comparison of rectal dose and grade of bleeding

Variables	Grade 0–1	Grade 2–3	P-value
	(n = 101)	(n = 28)
Rmax (Gy)	76.9 ± 6.7	77.6 ± 6.8	0.451
V75 (%)	5.1 ± 4.9	5.6 ± 5.3	0.695
V70	7.3 ± 6.7	9.7 ± 8.1	0.173
V65	15.0 ± 4.8	19.5 ± 8.2	0.007
V60	20.0 ± 6.3	24.9 ± 10.0	0.019
V55	24.3 ± 9.6	29.5 ± 12.0	0.042
V50	28.1 ± 10.6	33.8 ± 13.7	0.048
V45	32.0 ± 10.9	38.1 ± 14.6	0.048
V40	36.2 ± 11.2	42.2 ± 14.8	0.050
V30	46.5 ± 12.2	53.0 ± 14.1	0.033
V20	62.7 ± 14.0	68.2 ± 12.5	0.050
V10	80.2 ± 14.8	85.4 ± 12.0	0.050

Rmax = maximum dose to rectum. The t-test was used to compare between two groups.