Table 4. Summary of the Bland-Altman and Bradley-Blackwood tests results between STE and SSI.
| Threshold (kPa) | Bland-Altman | Bradley-Blackwood | ||||
|---|---|---|---|---|---|---|
| Mean difference (kPa) | 95% LOA (kPa) | Cases exceeding 95% LOA‡ | F | P value* | ||
| Totality | 0.24 | −6.96 to 7.44 | 5.1% (211/4,152) | 184.424 | <0.001 | |
| ≤5† | 0.62 | −0.85 to 2.08 | 4.3% (8/185) | 63.307 | <0.001 | |
| <9† | 0.78 | −2.00 to 3.57 | 6.2% (154/2,473) | 376.312 | <0.001 | |
| 9–13† | 0.56 | −5.23 to 6.34 | 6.2% (56/897) | 18.122 | <0.001 | |
| >13† | −1.83 | −15.70 to 12.03 | 5.9% (46/782) | 33.137 | <0.001 | |
| >17† | −3.05 | −20.81 to 14.71 | 5.9% (21/356) | 20.162 | <0.001 | |
| <7† | 0.81 | −1.28 to 2.90 | 5.6% (85/1,521) | 441.596 | <0.001 | |
†, thresholds recommended by the SRU. The first five thresholds refer to “rule of four”, and <7 kPa could help rule out significant fibrosis; ‡, numbers in parentheses are raw data; *, all of the Bradley-Blackwood tests were significant (P<0.001). STE, sound touch elastography; SSI, supersonic shear imaging; 95% LOA, 95% limit of agreement; SRU, Society of Radiologists in Ultrasound.