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Table 7 Measurement of the agreement by kappa value and comparison between the observed US accuracy and the expected accuracy done by operation approach

From: Role of MSCT in the diagnosis of perforated gall bladder (a retrospective study)

 US GBP classificationTotal
US negativeUS-classified type IUS-classified type II
Gall bladder perforation classification made based on operative findingsOperation-classified type ICount4105
% within gall bladder perforation classification made based on operative findings80.0%20.0%0.0%100.0%
% within US GBP classification30.8%100.0%0.0%26.3%
Operation-classified type IICount90514
% within gall bladder perforation classification made based on operative findings64.3%0.0%35.7%100.0%
% within US GBP classification69.2%0.0%100.0%73.7%
TotalCount131519
% within gall bladder perforation classification made based on operative findings68.4%5.3%26.3%100.0%
% within US GBP classification100.0%100.0%100.0%100.0%
Symmetric measures
 ValueAsymp. Std. ErroraApprox. TbApprox. Sig.
Measure of agreementKappa0.1360.0682.0520.040
N of valid cases19   
  1. aNot assuming the null hypothesis
  2. bUsing the asymptotic standard error assuming the null hypothesis