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Table 2 Observed and expected concordances and Kappa coefficient for the comparisons between US, NCS and surgery

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 < 0.001
US vs. NCS 76.5% 69.4% 0.232 0.091 2.54 0.006
  1. NCS nerve conduction studies, US ultrasonography
  2. There were 115 subjects in each comparison group