Table 4.

Hierarchical Regressions of Age and Education Predicting Fractional Anisotropy

Dependent Variable: Fractional Anistropy	Step	Model	R2 change	Sig F change	Beta	P
Superior Longitudinal Fasciculus	1	Age	0.027	0.271	0.164	0.271
	2	Age			0.738	0.002
		Years of Education	0.189	0.002	-0.720	0.002
Cingulum Bundle	1	Age	0.029	0.252	0.171	0.252
	2	Age			0.747	0.002
		Years of Education	0.191	0.002	-0.723	0.002
Anterior Corona Radiata	1	Age	0.019	0.357	0.137	0.357
	2	Age			0.700	0.002
		Years of Education	0.182	0.003	-0.706	0.003
Uncinate Fasiculus	1	Age	0.016	0.398	0.398	0.398
	2	Age			0.572	0.572
		Years of Education	0.040	0.178	0.178	0.178

In each region of interest (ROI), hierarchical regressions were conducted with age and then years of education as independent variables. Fractional anisotropy (FA) values in each respective ROI were the dependent variables. When adjusting for age, educational attainment significantly predicted FA in the superior longitudinal fasiculus, the cingulum bundle, and the anterior corona radiata, three ROIs that have previously been linked with cognitive control. In contrast, years of education did not account for variance in FA in the uncinate fasiculus, a control region which has not been linked to cognitive control.