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Table 3 Median nerve mean stiffness value by ultrasound elastography across CTS severity subgroups

From: Diagnostic value of median nerve shear wave ultrasound elastography in diagnosis and differentiation of carpal tunnel syndrome severity

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
  1. CTS carpal tunnel syndrome, kPa kilopascals, NCS nerve conduction studies