Table 3.

Associations between increasing mean diffusivity and increasing systolic blood pressure and age by fibre label

	Total number of voxels	Number of voxels associated with increasing systolic blood pressure	Number of voxels associated with increasing age
Corpus callosum*
Medial occipital gyrus	2454	282	1758
Post-central gyrus	1707	0	909
Pre-central gyrus	2159	0	1193
Rectus	537	96	201
Superior frontal gyrus	15 550	1051	4644
Superior occipital gyrus	4336	391	3035
Superior parietal gyrus	4959	34	3081
Cingulum	5873	14	3253
Corticospinal tract	5788	62	2763
Inferior fronto-occipital tract	9121	1828	5102
Inferior longitudinal fasciculus	7896	263	4358
Short association fibres
Inferior occipital gyrus	2021	0	710
Superior frontal gyrus and supramarginal gyrus	3904	0	1269
Postcentral gyrus	1758	4	873
Precentral gyrus	3326	0	1166
Superior parietal gyrus and angular gyrus	4038	37	1811
Superior parietal and middle occipital gyrus	857	19	666
Superior longitudinal fasciculus
Frontal and parietal	4815	181	3143
Frontal and temporal	2682	441	2101
Parietal and temporal	5341	383	3253
Thalamic radiations†
Inferior frontal	401	121	175
Middle frontal gyrus	1638	404	1024
Post-central gyrus	1408	34	1113
Pre-central gyrus	1992	120	1650
Superior frontal gyrus	7374	978	5201
Superior occipital gyrus	989	76	518
Superior parietal gyrus	1722	77	1401
Uncinate	3444	425	620

Data are n. Regions of interest listed here only when the number of voxels associated with systolic blood pressure or age made up at least 1% of the total number of associated voxels. Fibre labels according to the Johns Hopkins University probabilistic fibre map atlases.³³

^*Labels refer to fibres connecting the cortical areas in both hemispheres through the corpus callosum.

^†Labels indicate fibres that project from the thalamus.