Table 3 Median nerve mean stiffness value by ultrasound elastography across CTS severity subgroups
Variable | Mean stiffness value (at cutoff = 95.8 kPa) | CSA by US (at cutoff = 16.2 mm2) | Wrist/forearm ratio (at cutoff = 3.5) |
|---|---|---|---|
CTS with normal NCS/mild CTS (n = 22) | 78.71 ± 16.58 | 14.53 ± 1.6 | 2.73 ± 1.2 |
Moderate/severe CTS (n = 34) | 114.03 ± 15.51 | 18.9 ± 2.2 | 4.1 ± 0.6 |
P value | 0.001 | 0.065 | 0.074 |
Sensitivity (%) | 96.7 | 46 | 45 |
Specificity (%) | 97.8 | 43 | 42 |
AUC (area under curve) | 0.947 | 0.398 | 0.331 |
NPV (%) | 98 | 43.2 | 41.7 |
PPV (%) | 96 | 46.3 | 44.5 |