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 classification | Total | ||||||
| US negative | US-classified type I | US-classified type II | |||||
| 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. Errora | Approx. Tb | Approx. Sig. | ||||
| Measure of agreement | Kappa | 0.136 | 0.068 | 2.052 | 0.040 | ||
| N of valid cases | 19 | ||||||