Table 6.

Within- and between-laboratory reproducibility

Within laboratory	No. of samples	No. of trials	Fleiss' Kappa	95% CI	Z-score	p value
Lab 1	11*	3	0.876	(0.647, 1.000)	5.032	< 0.001
Lab 2	12	3	1.000	(1.000, 1.000)	6.000	< 0.001
Lab 3	12	3	0.880	(0.650, 1.000)	5.278	< 0.001

Between Laboratory	No. of samples	No. of trials	Fleiss' Kappa	95% CI	Z-score	p value
	15*	3	0.860	(0.676, 1.000)	6.490	< 0.001

*Missing result is excluded from the sample count