Table 4.

Multivariate analyses of the interactions between Education and Income with Race as related to brain volume measures (N = 147)

	Outcome
	Total Brain Volume			Gray Matter Volume			White Matter Volume			White Matter Lesion Volume
Interaction Term	b	part η2	P	b	part η2	p	b	part η2	p	b	part η2	p
Continuous Education × Race	−9.42	0.016	0.041	−5.26	0.017	0.028	−4.16	0.013	0.085	−0.065	0.003	0.56
Trichotomous Education × Race
Education 2nd Tertile × Race	−62.56	0.014	0.051	−31.82	0.013	0.058	−30.74	0.014	0.068	−0.834	0.009	0.28
Education 3rd Tertile × Race	−87.01	0.025	0.010	−43.30	0.022	0.014	−43.71	0.026	0.013	−0.884	0.009	0.28
Dichotomous Education × Race	73.54	0.024	0.012	37.00	0.021	0.015	35.53	0.024	0.017	0.949	0.013	0.18
Poverty Status × Race	58.33	0.016	0.038	29.00	0.014	0.049	29.33	0.017	0.046	0.689	0.007	0.32
Trichotomous Income × Race
Income 2nd Tertile × Race	−49.74	0.011	0.090	−23.64	0.009	0.12	−26.10	0.012	0.090	−0.497	0.004	0.49
Income 3rd Tertile × Race	−94.71	0.017	0.034	−47.88	0.015	0.040	−46.84	0.017	0.045	0.758	0.018	0.12

Data reflect unstandardized regression coefficients (b), semipartial η², and p-values illustrating associations between Education × Race and Income × Race interactions with brain volume measures for various education and income variables