The values presented in the table correspond to Spearman’s Rho followed by (p values) for the correlations between the fractional anisotropy or mean diffusivity of white matter tracts and PET networks SUVRs, while controlling for age, sex and presence of cognitive impairment. Values in bold correspond to significant group differences after adjusting for multiple comparisons with false discovery rate corrections (FDR) (q < 0.05). Correlations were carried out in all amyloid-β positive individuals: 28 amyloid-β positive cognitively normal subjects (CN Aβ+), 18 patients with mild cognitive impairment (MCI Aβ+) and 26 patients with Alzheimer’s disease (AD Aβ+). Three AD patients and 1 MCI patient were excluded due to being outliers in white matter measures. ATR, anterior thalamic radiation; CST, cortico-spinal tract; CCT, cingulate cingulum tract; HCT, hippocampal cingulum tract; FMAJ, forceps major; FMIN, forceps minor; IFO, inferior fronto-occipital fasciculus; ILF, inferior longitudinal fasciculus; SLF, superior longitudinal fasciculus; SLFt, temporal part of the superior longitudinal fasciculus; UNC, uncinate fasciculus.