Fig. 4

The ROC curve of AT E for detecting diabetic tendinopathy with the sensitivity and the 1 − specificity as the ordinate and abscissa respectively. The optimal cutoff point for the E of the distal segment of AT was 347.44 kPa (sensitivity, 76.8%; specificity, 69.9%; AUC, 0.779; 95% CI, 0.731–0.827), for the middle segment was 441.57 kPa (sensitivity, 71.3%; specificity, 59.2%; AUC, 0.692; 95% CI, 0.638–0.746), and for the proximal segment was 484.35 kPa (sensitivity, 75.6%; specificity, 56.6%; AUC, 0.676; 95% CI, 0.621–0.732). ROC, receiver operator characteristics; E, Young’s modulus; AUC, area under the curve; CI, confidence interval