Table 2.

Correlations between diffusion tensor–derived parameters and age in the older subject group, before and after covarying for sex and white matter volume

Region of interestBefore covaryingCovarying for volume/sex
Pearson’s rp ValuePearson’s rp Value
Correlations significant at the p < 0.05 level, after covarying, are shown in boldface type.
FA = fractional anisotropy.
Total white matter
    Volume−0.390.095
    FA−0.600.007−0.570.017
    Diffusivity0.690.0010.680.003
Anterior white matter
    Volume−0.550.016
    FA−0.650.002−0.530.029
    Diffusivity0.680.0010.650.005
Middle white matter
    Volume−0.310.194
    FA−0.480.039−0.420.090
    Diffusivity0.74<0.0010.84<0.001
Posterior white matter
    Volume−0.110.652
    FA−0.260.276−0.220.400
    Diffusivity0.380.1080.420.090