Table A3.

Baseline sample characteristics in cases with at least 2 visits and their matched controls

	Mild cognitive impairment/Alzheimer’s disease (n=53)	Age- and sex- matched controls (n=106)	p value
Mean [SD] or No. (%)
Demographics
Age, years	79.4 [6.0]	79.5 [5.9]	0.955
Women	24 (45)	58 (45)	0.999
Black	10 (19)	11 (10)	0.144
Body mass index, kg/m2	25.9 [3.9]	25.7 [3.3]	0.655
Education, years	17 [4]	17 [3]	0.418
Average number of visits	3.6 [1.4]	4.5 [1.8]	<0.001*
Average years of follow-up †	5.8 [2.2]	5.6 [2.4]	0.681
Age at onset ‡	85.2 [5.7]	85.1 [5.5]	0.912
Lap time variation, sec	0.945 [0.444]	0.846 [0.404]	0.161
Covariates
Fast gait speed over 400m, m/sec	1.34 [0.26]	1.43 [0.20]	0.024*
6-meter usual gait speed, m/sec	1.03 [0.21]	1.08 [0.19]	0.150
6-meter rapid gait speed, m/sec	1.55 [0.36]	1.65 [0.28]	0.059
Delta TMT, sec	63.8 [31.6]	61.7 [46.3]	0.735
CVLT immediate recall	44.8 [13.2]	48.3 [12.4]	0.102

Footnote:

^*p<0.05.

^†from the initial assessment of 400m to the time of symptom onset for cases and to the most recent visit for controls.

^‡age at the most recent visit for controls.

TMT=Trail Making Test. CVLT=California Verbal Learning Test.