Table 2.

Correlations between CSF GAP-43 and other biomarkers.

Baseline biomarkers	Baseline CSF GAP-43
	β coefficient	P value	R2
CSF Aβ42	0.01	0.819	0.088
CSF p-tau	0.745	< 0.001	0.523
CSF t-tau	0.745	< 0.001	0.550
Plasma Aβ42/40	− 0.077	0.273	0.035
Plasma p-tau	0.086	0.015	0.068
Plasma NfL	0.04	0.355	0.063

Baseline levels of all biomarkers were standardized to z scores so that the effects could be directly compared. Data are β coefficients (with P values) from linear regression models which were used to test associations between CSF GAP-43 and other biomarkers, adjusted for age, sex, education level, and APOE ε4 genotype.

CSF, cerebrospinal fluid; p-tau, phosphorylated tau 181; t-tau, total tau; NfL, neurofilament light.