Fig. 2From: Normal tissue complication models for clinically relevant acute esophagitis (≥ grade 2) in patients treated with dose differentiated accelerated radiotherapy (DART-bid)NTCP for AE ≥ grade 2 is shown as a function of mean esophageal dose (MED). Red x-symbols represent patients with AE ≥ grade 2, green x-symbols represent patients without toxicity. The actually observed AE rates are shown as bold squares in the centers of corresponding histogram bins (chosen to represent a comparable number of patients). Errors shown are binomial confidence intervals, χ 2 of the fit and the upper threshold according to Chi-square statistics (α = 5 %) are given for each modelBack to article page