. Author manuscript; available in PMC: 2007 Jun 18.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2005 Oct 19;64(2):518–526. doi: 10.1016/j.ijrobp.2005.07.970

Table 7. Multivariate analysis of maximum acute gastrointestinal toxicity.

Variable	Chi-square	RR (95% CI)	p value
Rectal V65/50	3.9	1.109 (1.002–1.228)	0.046

Covariates not significant: bladder maximum dose; rectal maximum dose; rectal volume; rectal V40/31; PTV1 volume; PTV1 mean dose; PTV1 maximum dose; iPSA; AD (no vs. yes); T-stage (T1–T2 vs. T3); risk group (intermediate vs. high); treatment group (Arm I vs. Arm II). Covariates were continuous unless indicated otherwise.

The increase in acute toxicity over pretreatment status was used (see Patients and Methods) in stepwise ordinal logistic regression.