Fig. 2
a Nomogram for individualized prediction of radiotherapy-related esophageal fistula in patients with esophageal cancer. PS 0: ECOG PS ≤ 2; 1: ECOG PS ≥3. BMI 1: < 18.5 kg/m2; 2: 18.5–23.9 kg/m2; 3: 24–27.9 kg/m2; 4: ≥28 kg/m2. T4 0: T1–3 stage; 1: T4 stage. N_stage 0: N0–1 stage; 1: N2–3 stage. re_radio 0: no re-radiotherapy; 1: re-radiotherapy. b Calibration curve in internal validation. c Receiver under the operator characteristic (ROC) curve for the test accuracy of the final risk score in the internal validation sample (C-index = 0.805, 95% CI 0.762 to 0.848). d Calibration curve in external validation