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Table 6 Measurement of the agreement by kappa value and comparison between the observed CT accuracy and the expected accuracy done by operation approach

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

 CT gall bladder perforation classificationTotal
CT-classified type ICT-classified type II 
Gall bladder perforation classification made based on operative findingsOperation-classified type ICount505
% within gall bladder perforation classification made based on operative findings100.0%0.0%100.0%
% within CT gall bladder perforation classification100.0%0.0%26.3%
Operation-classified type IICount01414
% within gall bladder perforation classification made based on operative findings0.0%100.0%100.0%
% within CT gall bladder perforation classification0.0%100.0%73.7%
TotalCount51419
% within gall bladder perforation classification made based on operative findings26.3%73.7%100.0%
% within CT gall bladder perforation classification100.0%100.0%100.0%
Symmetric measures
 ValueAsymp. Std. ErroraApprox. TbApprox. Sig.
Measure of AgreementKappa1.0000.0004.3590.001
N of valid cases19   
  1. aNot assuming the null hypothesis
  2. bUsing the asymptotic standard error assuming the null hypothesis