Table 3. Demographics of subjects included in this study and their classification in the training and testing sets according to normal, MCI, and mild dementia following clinical decision based on the CDR scale.

Characteristic	Normal*	MCI†	Mild dementia‡
No. of subjects (n=2,209)	1,649	453	107
Age	70.84±9.55	74.77±10.18	78.09±9.24
Males (females)	606 (1,043)	179 (274)	59 (48)
Education	8.99±5.04	7.32±5.27	6.78±5.18
Training	1,640	450	107
Testing	800	150	40

Data are shown as mean±standard deviation.

MCI: mild cognitive impairment, CDR: clinical dementia rating.

^*Normal, normal subjects classified with the clinical decision based on CDR scale of 0; ^†MCI, MCI subjects classified with clinical decision based on CDR scale of 0.5; ^‡Mild dementia, mild dementia subjects classified with the clinical decision based on CDR scale of 1.0.