Table 3.

Intra- and inter-observer agreement based on slides treated with different antigen retrieval buffers

Antigen retrieval buffer	Inter-observer agreement Fleiss’ Kappa		Intra-observer agreement Cohen’s Kappa
	Value	95% CI	Value	95% CI
EDTA (pH 8.0)	0.912	(0.862, 0.912)	0.955	(0.918, 0.992)
Na Citrate (pH 6.0)	0.753	(0.677, 0.829)	0.853	(0.790, 0.916)
EDTA (pH 9.0)	0.643	(0.558, 0.728)	0.801	(0.730, 0.872)
P	< 0.05		< 0.05