Table 2.

Regression β-Coefficients and Root Mean Squared Errors from Linear Regression Models from 8 Cognitive Tests.

	Intercept	Age*	Black	<High School	High School or Equivalent	Black× <High School Interaction	Black× High School or Equivalent Interaction	Root Mean Squared Error
Delayed Word Recall Test	6.785	−0.068	−0.636	-0.428	-0.387	−0.024	0.053	1.458
Logical Memory Part I, Story A	12.719	−0.094	−1.846	−1.575	−1.669	−0.910	−0.159	3.587
Logical Memory Part II, Story A	9.519	−0.140	−2.152	−1.62	−1.617	−0.510	−0.158	3.859
Logical Memory Part I, Sum of Stories A and B	25.309	−0.218	−4.094	−3.222	−3.153	−0.878	−0.0381	6.291
Logical Memory Part II, Sum of Stories A and B	20.006	−0.270	−5.294	−3.770	−3.197	−0.365	−0.268	6.952
Word Fluency Test	39.811	−0.231	−2.841	−12.286	−7.220	−3.171	−2.484	10.560
Animal Naming	19.874	−0.159	−3.096	−3.354	−2.527	0.306	−0.287	4.180
Trail Making Test Part A **	3.526	0.019	0.365	0.247	0.098	0.206	0.102	0.341
Trail Making Test Part B**†	4.426	0.021	0.439	0.455	0.229	−0.029	0.015	0.367
Digit Symbol Substitution Test	48.967	−0.529	−10.953	−10.957	−5.077	−2.606	−1.840	9.612

^*Age is continuous and centered at median (71 years).

^**Coefficients in table represent ln(Trail Making Test Part A) and ln(Trail Making Test Part B) scores. Higher score represents worse performance.

^†Subsample of participants who completed Trail Making Test Part B (n=651).

Note: Education is defined as: 1.) <High school, 2.) High school or equivalent (includes high school, GED, or vocational school), and 3.) >High school (includes college, graduate, or professional school).

Reference groups are white race and education >high school.

Bold coefficients represent p<0.05.