Table 5. The diagnostic performance of SWE for the prediction of high nodal burden group with the optimal cutoff values.

SWE	Cutoff value	AUC (95% CI)	Sen	Spe	ACC	PPV	NPV
SWE values of tumor
Emax, kPa	119.52	0.642 (0.562–0.722)	0.843	0.385	0.457	0.204	0.929
Emean, kPa	97.31	0.635 (0.555–0.715)	0.843	0.403	0.472	0.209	0.932
Esd, kPa	19.38	0.646 (0.567–0.726)	0.647	0.615	0.620	0.239	0.903
SWE values of ALN
Emax, kPa	26.22	0.856 (0.802–0.909)	0.725	0.868	0.846	0.507	0.944
Emean, kPa	19.79	0.841 (0.784–0.898)	0.804	0.773	0.778	0.398	0.955
Eratio	2.32	0.762 (0.832–0.691)	0.725	0.678	0.685	0.296	0.930
Esd, kPa	3.34	0.836 (0.777–0.896)	0.647	0.886	0.849	0.516	0.931

SWE, shear wave elastography; ALN, axillary lymph nodes; AUC, area under the curve; Sen, sensitivity; Spe, specificity; ACC, accuracy; PPV, positive predictive value; NPV, negative predictive value; Emax, maximum stiffness; Emean, mean stiffness; Eratio, stiffness ratio; Esd, stiffness standard deviation.