Table 3.

Racial differences in brain mean diffusivity in multivariable linear regression models. Dependent variable: mean diffusivity.

Model	Independent variable	Beta coefficient	Standard error	p--value
1	Race, black	−.041	.013	.002
2	Race, black	−.033	.013	.010
	Gender, female	−.041	.013	.002
3	Race, black	−.041	.014	.004
	Health literacy, ≥ 9th grade	.000	.019	.99
4	Race, black	−.045	.014	.001
	Education, >high school	−.019	.013	.16
5	Race, black	−.042	.014	.003
	Family income, ≥ 25K annual	−.005	.015	.72
6	Race, black	−.047	.013	.000
	Diabetes, present	.043	.015	.004
7	Race, black	−.038	.014	.006
	Body mass index, (kg/m2)	−.002	.002	.28
8	Race, black	−.038	.014	.007
	Current drinker, yes	.007	.014	.62
9	Race, black	−.048	.014	.001
	Gender, female	−.047	.013	.001
	Education, >high school	−.027	.013	.04
	Diabetes, present	.037	.015	.01
	Hypertension, present	.028	.014	.04

Model 1: unadjusted.

Models 2 through 8: adjusted for variables that differed by race at p<0.05 (see Table 1); one variable entered each model.

Model 9: all the variables that differed by race at p<0.05 (see Table 1) entered this stepwise model, coefficients are reported for the variables retained in the last step.