Table 1.

Participant demographics at baseline

Characteristic	Training set			Testing set
	NL, $n=405$	MCI, $n=698$	AD, $n=266$	NL, $n=114$	MCI, $n=156$
Age	74.5 (5.81)	72.8 (7.62)	74.9 (7.71)	73.3 (5.78)	73.5 (7.40)
Male	197 (48.6%)	413 (59.2%)	149 (56.0%)	56 (49.1%)	91 (58.3%)
White	372 (91.9%)	651 (93.3%)	246 (92.5%)	100 (87.7%)	146 (93.6%)
Education	16.3 (2.62)	15.9 (2.85)	15.3 (3.02)	16.5 (2.97)	16.0 (2.85)
Single $\epsilon 4$	105 (26.0%)	280 (40.2%)	132 (50.0%)	32 (28.1%)	56 (35.9%)
$\epsilon 4/\epsilon 4$	7 (1.73%)	75 (10.8%)	46 (17.4%)	5 (4.39%)	18 (11.5%)
No. of visits	4.21 (2.28)	4.45 (1.97)	2.71 (1.14)	4.25 (2.27)	4.37 (2.04)
Follow-up	3.15 (2.38)	2.75 (1.84)	1.14 (0.84)	3.14 (2.44)	2.80 (1.99)

Abbreviations: AD, Alzheimer's disease; MCI, mild cognitive impairment; NL, cognitively normal.

NOTE. Continuous variables are reported as “mean (standard deviation)” and categorical variables are reported as “count (percentage)”.