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

Egyptian Journal of Radiology and Nuclear Medicine

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

				US GBP classification			Total
				US negative	US-classified type I	US-classified type II	Total
Gall bladder perforation classification made based on operative findings		Operation-classified type I	Count	4	1	0	5
			% within gall bladder perforation classification made based on operative findings	80.0%	20.0%	0.0%	100.0%
			% within US GBP classification	30.8%	100.0%	0.0%	26.3%
		Operation-classified type II	Count	9	0	5	14
			% within gall bladder perforation classification made based on operative findings	64.3%	0.0%	35.7%	100.0%
			% within US GBP classification	69.2%	0.0%	100.0%	73.7%
Total			Count	13	1	5	19
			% within gall bladder perforation classification made based on operative findings	68.4%	5.3%	26.3%	100.0%
			% within US GBP classification	100.0%	100.0%	100.0%	100.0%
Symmetric measures
		Value	Asymp. Std. Error^a	Approx. T^b	Approx. Sig.
Measure of agreement	Kappa	0.136	0.068	2.052	0.040
N of valid cases		19