Table 1.

Sample characteristics and mobility measures and their associations with lap time variation (n=449)

	Mean ± SD or n (%)	Range	Correlations with lap time variation, r (p) or MD±SE (p)
Demographics
Age, yrs	70.8±9.7	50.2–94.9	0.342 (<0.001)
Female	256 (56.8)	-	0.024±0.038 (0.531)
White	284 (63.3)	-	0.086±0.039 (0.029)
Education, yrs	17.0±2.7	8–32	0.011 (0.809)
Height, cm	167.4±9.3	141.6–192.4	−0.176 (<0.001)
Weight, kg	76.3±15.1	43.1–138.6	0.028 (0.548)
Health conditions
Former or current smokers	167 (37.2)	-	0.020±0.039 (0.614)
Heart attack	13 (2.9)	-	−0.104±0.067 (0.360)
Hypertension	221 (49.2)	-	0.085±0.038 (0.026)
Diabetes	85 (18.9)	-	0.114±0.060 (0.060)
Mean diffusivity in ROIs^, unitless
Precentral gyrus	1.107±0.117	0.872–1.831	0.159 (0.001)
Postcentral gyrus	1.143±0.119	0.907–2.116	0.192 (<0.001)
Supplementary motor cortex	1.041±0.110	0.812–1.918	0.217 (<0.001)
Precuneus	1.146±0.126	0.865–1.858	0.335 (<0.001)
Putamen	0.811±0.108	0.603–1.968	0.253 (<0.001)
Caudate	0.857±0.126	0.653–2.176	0.232 (<0.001)
Thalamus Proper	0.992±0.096	0.809–2.093	0.287 (<0.001)
Middle frontal gyrus	1.125±0.090	0.916–1.415	0.204 (<0.001)
Superior parietal lobe	1.085±0.116	0.801–2.146	0.231 (<0.001)
Anterior cingulate gyrus	1.224±0.140	0.415–1.828	0.315 (<0.001)
Middle cingulate gyrus	1.183±0.120	0.924–1.855	0.291 (<0.001)
Posterior cingulate gyrus	1.236±0.133	0.925–1.710	0.333 (<0.001)
Hippocampus	1.320±0.170	0.970–2.365	0.289 (<0.001)
Parahippocampal gyrus	1.353±0.164	1.020–2.511	0.297 (<0.001)
Entorhinal area	1.388±0.287	0.903–2.844	0.178 (<0.001)
Amygdala	1.001±0.154	0.764–2.463	0.189 (<0.001)
Mobility measures
Lap time variation, sec	0.81±0.40	0.20–3.46	-
Use of walking aid	6 (1.3)	-	-
Mean lap time, sec	27.5±6.4	15.7–72.8	0.621 (<0.001)
Rapid gait speed, m/sec	3.7±0.9	1.9–8.7	0.383 (<0.001)

Note:

^{^}multiplied by 1,000.