Table 4. Predictive performance compared with plain radiography and bone scintigraphy.

	LR High sensitivity Model	LR High specificity Model	SVM High sensitivity Model	SVM High specificity Model	Plain radiograph (Presence of vascular calcification)	Bone scintigraphy
TP	13	12	13	12	10	7
TN	9	11	8	10	4	9
FN	1	2	1	2	4	7
FP	2	0	3	1	7	2
Sensitivity	0.93	0.86	0.93	0.86	0.71	0.50
Specificity	0.82	1	0.73	0.91	0.36	0.82
AUC	0.95		0.92		0.54	0.66
AUC 95% CI	0.86–1.0		0.80–1.0		0.31–0.71	0.42–0.88

LR, logistic regression; SVM, support vector machine; AUC, areas under the ROC curves; ROC, receiver operating characteristic; TP, true positive; TN, true negative; FN, false negative; FP, false positive.