. Author manuscript; available in PMC: 2022 Apr 1.

Published in final edited form as: J Thorac Oncol. 2020 Dec 24;16(4):619–629. doi: 10.1016/j.jtho.2020.12.005

Table 3.

Inter-observer agreement on interpretations of STAS and artifact in frozen (FS), corresponding permanent (FSP) and non-frozen permanent (NFP) sections among five pathologists

		STAS		Artifact

	Round	Mean Inter-observer Concordance rate (%) (95% CI)	Fleiss’ Kappa (mean κ ± SE)	Mean Inter-observer Concordance rate (%) (95% CI)	Fleiss’ Kappa (mean κ ± SE)
FS	1	75.8 (72.9-78.7)	0.453 ± 0.032	65.0 (62.5-67.5)	0.300 ± 0.032
	2	77.4 (74.5-80.3)	0.506 ± 0.032	60.2 (54.3-66.1)	0.204 ± 0.032

FSP	1	76.6 (72.4-80.8)	0.477 ± 0.032	70.6 (67.3-73.9)	0.377 ± 0.032
	2	79.6 (76.8-82.4)	0.571 ± 0.032	69.4 (63.1-75.7)	0.368 ± 0.032

NFP	1	79.6 (75.9-83.3)	0.585 ± 0.032	65.6 (60.6-70.6)	0.303 ± 0.032
	2	82.6 (78.1-87.1)	0.646 ± 0.032	67.6 (63.3-71.9)	0.331 ± 0.032

CI: confidence interval; SE: standard error