Table 3. Diagnostic performance of continuous magnetic resonance imaging parameters of internal mammary lymph nodes.

Variable	AUC	95% CI	p-value*	Threshold	Youden index	Se (%)	Sp (%)	PPV (%)	NPV (%)
Short axis length (mm)	0.951	0.861-0.990	< 0.001	> 4	0.7671	92.5	84.2	92.5	84.2
Long axis length (mm)	0.906	0.801-0.966	< 0.001	> 10	0.6447	75.0	89.5	93.7	63.0
S/L ratio	0.756	0.627-0.858	< 0.001	> 0.5	0.5171	67.5	84.2	90.0	55.2

AUC=area under the receiver operating characteristics (ROC) curve; CI=confidence interval; Se=sensitivity; Sp =specificity; PPV=positive predictive value; NPV=negative predictive value; S/L ratio=short axis length/long axis length ratio.

^*ROC curve analysis for variables to differentiate benign and malignant lymph nodes.