Fig. 5

ROC curves for each dependent variable– (A) Breast symmetry change, (B) Nipple to IMF distance change, and (C) Nipple Y-axis coefficient change. The AUC of combined predictors for A is 0.723, B 0.686, and C 0.744. The best cut-off points for A are group (0.760, 0.857) with Youden’s index 0.097, age (0.240, 0.500) with 0.260, BMI (0.520, 0.786) with 0.266, radiation dose (0.120, 0.357) with 0.237, and combined predictors (0.320, 0.786) with 0.466. The best cut-off points for B are group (0.750, 0.867) with Youden’s index 0.117, age (0.500, 0.800) with 0.300, BMI (0.083, 0.200) with 0.117, radiation dose (0.083, 0.400) with 0.317, and combined predictors (0.125, 0.533) with 0.408. Finally, the best cut-off points for C are group (0.800, 0.778) with Youden’s index − 0.220, age (0.967, 1.00) with 0.033, BMI (0.100, 0.444) with 0.344, radiation dose (0.667, 0.667) with 0, and combined predictors (0.233, 0.667) with 0.433