Table 4. Cohen’s Kappa concordance analysis of the assays and overall (all samples included) agreement of results given as %.

Abbott	Euroimmun	DiaSorin	Healgen	Cohen’s Kappa (±SD) % agreement
0.950 (0.019) 97.9%	0.907 (0.034) 96.6%	0.892 (0.027) 94.8%	0.745 (0.083) 88.2%	EDI
	0.892 (0.037) 96.1%	0.891 (0.027) 94.8%	0.777 (0.078) 89.6%	Abbott
		0.852 (0.043) 94.7%	0.631 (0.111) 82.7%	EuroImmun
			0.485 (0.109) 76.1%	DiaSorin

Equivocal results were considered negative.