Table 2:

Corpus Callosum Diffusion MRI Measures and Plasma Total Tau

	Region	Mean	StdDev	Partial R	P Value
FA	CC1	0.6096	0.0406	0.1584	0.4374
	CC2	0.6738	0.0366	0.2093	0.4374
	CC3	0.7069	0.0367	0.1528	0.4374
	CC4	0.7306	0.0323	0.0249	0.8705
	CC5	0.7346	0.0373	0.0733	0.8705
	CC6	0.7281	0.0242	0.0190	0.8705
	CC7	0.7391	0.0238	−0.0557	0.8705
Trace (mm²/s)	CC1	0.0014	0.0001	0.2424	0.2439
	CC2	0.0016	0.0001	0.1387	0.4064
	CC3	0.0015	0.0001	−0.0535	0.7536
	CC4	0.0015	0.0001	−0.1565	0.4064
	CC5	0.0016	0.0001	−0.0121	0.9171
	CC6	0.0016	0.0001	−0.1412	0.4064
	CC7	0.0016	0.0001	−0.0979	0.5602
AD (mm²/s)	CC1	0.0009	0.0001	0.2996	0.0440
	CC2	0.0011	0.0001	0.2850	0.0440
	CC3	0.0011	0.0001	0.0499	0.7797
	CC4	0.0011	0.0001	−0.1268	0.5544
	CC5	0.0012	0.0001	0.0129	0.9119
	CC6	0.0012	0.0001	−0.1164	0.5544
	CC7	0.0012	0.0001	−0.0890	0.6227
RD (mm²/s)	CC1	0.0003	<0.0000	0.09706	0.7583
	CC2	0.0003	<0.0000	−0.1013	0.7583
	CC3	0.0002	<0.0000	−0.1340	0.7583
	CC4	0.0002	<0.0000	−0.0711	0.7583
	CC5	0.0002	<0.0000	−0.0142	0.9034
	CC6	0.0003	<0.0000	0.0804	0.7583
	CC7	0.0002	<0.0000	−0.0342	0.8973

Associations of plasma total tau with diffusion parameters of corpus callosum (CC) subregions. Mean, standard deviation (StdDev), partial r and p values are presented. Significant results are marked in bold.

^*For CC1 there were only 74 subjects included since one data point was missing after clustering.

Abbreviations: FA = Fractional Anisotropy; AD = Axial Diffusivity; RD = Radial Diffusivity; StdDev = Standard Deviation.