Mediational models for <i>APOE</i>, white matter microstructure, and PS in the total sample (<i>n</i> = 652) and in the DTI subsample (<i>n</i> = 89).

Note. APOE = apolipoprotein E, PS = perceptual speed, DTI = diffusion tensor imaging, STD = standardized, FA = fractional anisotropy, MD = mean diffusivity, FMAJ = forceps major, CS = corticospinal tract. All effects were adjusted for age. Mediational models for APOE, white matter microstructure, and PS in the total sample (n = 652) and in the DTI subsample (n = 89).