Table 5.

ROC curve analysis for DVH parameters of the small bowel loops in relation to grade 1–2 chronic GI complications

			Optimal threshold
	AUC	95% CI	Value	Sensitivity/specificity (%)
Maximum dose	0.637	0.503-0.770	5586 cGy	64.3/67.9
V40 ratio	0.670	0.540-0.800	0.28	67.9/57.1

Abbreviations: AUC = area under the ROC curve; CI = confidence interval; DVH = dose-volume histogram; GI = gastrointestinal; ROC = receive operating characteristics; V30-50 volume = volume receiving more than respective dose; V30-50 ratio = volume receiving more than respective dose to total volume.