From: Effectiveness of ultrasonography and nerve conduction studies in the diagnosing of carpal tunnel syndrome: clinical trial on accuracy
Comparison
Observed concordance
Expected concordance
Kappa coefficient
Standard error
z
p
US vs. surgery
84.4%
72.9%
0.423
0.083
5.08
< 0.001
NCS vs. surgery
92.2%
77.8%
0.648
0.090
7.22
US vs. NCS
76.5%
69.4%
0.232
0.091
2.54
0.006