Table 2.

Summary of hierarchical linear regression analysis for predicting effect of processing speed on verbal learning (N = 141)

Variable	Model 1			Model 2			Model 3
	B	SE B	β	B	SE B	β	B	SE B	β
Years of education	0.202	0.352	0.049	0.222	0.350	0.054	0.161	0.299	0.039
Sex	0.763	2.582	0.025	0.789	2.565	0.026	0.112	2.194	0.004
Motor disability, average 25-ft walk, s				−0.594	0.356	−0.141	0.145	0.321	0.035
SDMT total score							0.547	0.076	0.548a
R2 block 1 = 0.003	R2 Δ = 0.003	F Δ = 0.219
R2 block 2 = 0.023	R2 Δ = 0.020	F Δ = 2.783
R2 block 3 = 0.292	R2 Δ = 0.269	F Δ = 51.693

Abbreviations: β, standardized beta coefficient; B, unstandardized beta coefficient; SDMT, Symbol Digit Modalities Test; SE B, standard error on beta.

^aP < .001.