Table 2.

Correlation matrix for the evaluated Aβ assays. The correlation between the levels of Aβ ₄₂ in different assays. The correlation coefficients for the neat and diluted CSF samples are shown in the upper right and lower left part, respectively.

	Innogenetics	Innogenetics	The Genetics	Innogenetics	Innogenetics	MSD
	ELISA (4G8)	ELISA	ELISA	AlzBio3	Aβ forms	Triplex
Innogenetics ELISA (4G8)	1	0.94	0.90	0.87	0.69	0.97
Innogenetics ELISA	0.96	1	0.82	0.93	0.81	0.92
The Genetics ELISA	0.93	0.88	1	0.75	0.53	0.87
Innogenetics AlzBio3	0.92	0.94	0.89	1	0.88	0.84
Innogenetics Aβ forms	0.78	0.86	0.67	0.86	1	0.66
MSD Triplex	0.98	0.96	0.93	0.93	0.77	1