Interobserver variation in histopathological assessment of Helicobacter pylori gastritis

Table 2 Kappa values and their 95% confidence intervals between three pathologists for H pylori gastritis

Variable	Pairwise analysis between pathologists
	1:2		1:3		2:3
	Kappa	95%CI	Kappa	95%CI	Kappa	95%CI
Chronic inflammation	0.49a	0.13-0.85	-0.34	NS	0.14	NS
Inflammatory activity	0.44a	0.13-0.71	-0.13	NS	-0.27	NS
Atrophy	0.31a	0.83-0.56	0.03	NS	0.14	NS
Intestinal metaplasia	0.51a	0.25-0.85	0.52a	0.20-0.80	0.62a	0.40-0.85
H pylori	0.40a	0.10-0.71	0.38a	0.06-0.71	0.56a	0.28-0.84
Surface epithelial damage	-0.01	NS	-	-	-	-

NS: Non-significant, 95%CI: 95% confidence interval, -: Kappa statistics could not be done because data table had less than two rows or columns;

^aP < 0.05.