Table 1.

Demographic data of participant groups.

	EC (n = 17)	AD (n = 22)	MCI (n = 22)	PD (n = 21)
Age (years) *	67.4 ± 9.3	74.0 ± 6.6	70.1 ± 6.8	66.1 ± 7.2
Edu (years)	9.5 ± 3.6	8.2 ± 5.1	7.4 ± 5.4	10.4 ± 2.9
MMSE +	27.2 ± 2.5	20.1 ± 4.7	24.4 ± 3.4	26.8 ± 2.9

Notes: Data presented as mean ± SD. * significant at p < 0.05; ⁺ significant at p < 0.01. Abbreviations: EC, elderly controls; AD, Alzheimer’s disease; MCI, mild cognitive impairment; PD, Parkinson’s disease; MMSE, Mini Mental State Examination.