Table 3. Clinical and demographic characteristics of participants.

Variables	Group			P value	Post hoc
	SCD (n = 26)	aMCI (n = 42)	AD (n = 29)
Age in years	68.46 ± 6.28	71.69 ± 7.30	73.62 ± 8.74	0.042	SCD < AD
Years of education	12.62 ± 3.68	12.57 ± 3.89	12.17 ± 4.48	NS
Gender, M/W	3/23	18/24	14/15	0.009
K-MMSE	29.04 ± 1.00	26.33 ± 2.35	20.45 ± 3.56	< 0.001	SCD > aMCI > AD

SCD = subjective cognitive decline, aMCI = amnestic mild cognitive impairment, AD = Alzheimer's disease, K-MMSE = Korean-Mini Mental State Examation, NS = not significant.