Table 6.

The inter-observer concordance rates and the Fleiss’ kappa (κ) statistics for the inter-observer analysis.

	Concordance Rate	Fleiss κ	95% CI
Predominant subtypes	76.1%	0.846	0.843–0.849
L (presence)	86.5%	0.814	0.809–0.819
A (presence)	98.0%	0.949	0.944–0.954
P (presence)	78.0%	0.708	0.703–0.713
S (presence)	92.0%	0.829	0.824–0.834
M (presence)	75.0%	0.531	0.526–0.536
CGP (presence)	88.0%	0.810	0.804–0.815

A, Acinar pattern; CGP, Complex glandular pattern; CI, confidence interval; L, Lepidic pattern; M, Micropapillary pattern; P, Papillary pattern; S, Solid pattern.