Table 3. Results of hierarchical regression models to predict changes in gait speed.

Gait speed (sec)	R2	β (95% CI)	βj	p
Gait speed (sec)*	33.1	0.449 (0.364 to 0.533)	0.434	<0.001
Grip Strength (kg)*	36.7 (3.6)	0.008 (0.003 to 0.013)	0.221	<0.001
BMI*	38.5 (1.8)	-0.013 (-0.019 to -0.006)	-0.149	<0.001
BV Change	39.8 (1.3)	3.101 (1.104 to 5.099)	0.114	0.002
WMH Change	40.9 (1.1)	-14.029 (-23.265 to -4.794)	-0.111	0.003

Adjusted R² (explanation of variance), betas (β), and confidence intervals (CI) and standardized beta-values (βj) are presented for significant findings only. Incremental explanation of variance is shown in brackets as delta of adjusted R². BV = brain volume, WMH = white matter hyperintensity volume. N=443

* at baseline with age 73.