Table 3.

Agreement of each IGF-1 assay method against each of the others, with the two new kits IMMULITE (new standard) and ROCHE expressed as weighted Kappa.

	LIAISON XL	iSYS	IMMULITE 2000	Mediagnost ELISA	Mediagnost RIA	IGF1-RIACT	IMMULITE New standard	ROCHE Elecsys®
Liaison XL	–	0.49	0.50	0.47	0.38	0.48	0.38	0.50
iSYS	0.49	–	0.64	0.61	0.70	0.64	0.55	0.75
IMMULITE 2000	0.50	0.64	–	0.61	0.58	0.64	0.65	0.64
Mediagnost ELISA	0.47	0.61	0.61	–	0.59	0.53	0.55	0.61
Mediagnost RIA	0.38	0.70	0.58	0.59	–	0.48	0.49	0.68
IGF1-RIACT	0.48	0.64	0.64	0.53	0.48	–	0.55	0.62
IMMULITE New standard	0.38	0.55	0.65	0.55	0.49	0.55	–	0.56
ROCHE Elecsys®	0.50	0.75	0.64	0.61	0.68	0.62	0.56	–