Table 3. Univariate analysis of SWE parameters between the limited nodal burden group and the high nodal burden group.
| SWE | Limited nodal burden (n=273) | High nodal burden (n=51) | P value |
|---|---|---|---|
| Median SWE values in tumor | |||
| Emax, kPa | 135.5 (102.7, 164.6) | 152.3 (127.6, 191.4) | 0.001 |
| Emean, kPa | 106.7 (81.6, 129.1) | 123.9 (102.3, 148.3) | 0.002 |
| Eratio | 9.7 (6.7, 13.8) | 10.5 (8.1, 14.3) | 0.262 |
| Esd, kPa | 17.5 (11.2, 24.4) | 22.8 (15.1, 27.7) | 0.001 |
| Median SWE values in ALN | |||
| Emax, kPa | 18.5 (13.7, 23.6) | 36.4 (24.2, 61.1) | <0.001 |
| Emean, kPa | 14.5 (10.8, 19.5) | 27.6 (20.2, 44.1) | <0.001 |
| Eratio | 1.8 (1.3, 2.6) | 2.8 (2.1, 5.2) | <0.001 |
| Esd, kPa | 1.8 (1.3, 2.6) | 4.1 (2.5, 7.1) | <0.001 |
Data presented as median (IQR). SWE, shear wave elastography; ALN, axillary lymph nodes; Emax, maximum stiffness; Emean, mean stiffness; Eratio, stiffness ratio; Esd, stiffness standard deviation.