TABLE 1.

Demographic, Clinical, and Genetic Characteristics of Study Group

Characteristic	All	Converted to Dementia	Remain Nondemented
N (% female)	51 (33%)	13 (23%)	35 (13%)
Age (year), mean (SD)	76.3 (7.2)	77.1 (5.0)	76.0 (7.8)
Education (year), mean (SD)	16.5 (2.8)	16.7 (2.9)	16.5 (2.8)
Baseline GDS, mean (SD)	6.3 (4.6)	5.2 (4.7)	6.8 (4.5)
Baseline MMSE, mean (SD)	28.2 (1.7)	27.5 (1.8)	28.5 (1.7)
Follow-up time (year), mean (SD)	2.7 (1.0)	3.1 (1.1)	2.5 (1.0)
Number with 2 timepoints	7	2	5
Number with 3 timepoints	24	6	18
Number with 4 timepoints	10	3	7
Number with 5 timepoints	7	2	5
Frequency of APOE ε4 allele carriers	46%	38%	49%

APOE indicates apolipoprotein E; GDS, Geriatric Depression Scale; MMSE, mini-mental state examination