Table 1.

Demographic data of all participates in this study

Characteristics	NC (n = 16)	a-MCI group (n = 14)	AD group (n = 17)	P
				NC versus a-MCI	NC versus AD	a-MCI versus AD
Age (years), mean ± SD	64.1 ± 9.1	69.1 ± 10.6	68.9 ± 10.0	0.95	0.15	0.17
Male/female, n	10/6	7/7	10/7	0.62	0.82	0.49
Education level, n				0.09	0.71	0.16
5 years ≤ time <8 years	3	5	2
8 years ≤ time <11 years	6	8	9
11 years ≤ time <15 years	6	1	6
Time ≥15 years	1	0	0

NC: Normal controls; a-MCI: Amnestic mild cognitive impairment; AD: Alzheimer's disease; SD: Standard deviation.