Demographic data of the study groups.

Chi square was used for gender comparison. One-way ANOVA test with Bonferroni correction for multiple comparisons was used for age and MMSE score comparisons (significance level: pcorr<0.05). Abbreviations: HC = healthy controls; aMCI = amnestic mild cognitive impairment; AD = Alzheimer's disease; M/F = males/females; CDR = clinical dementia rating scale; MMSE = mini-mental state examination; SD = standard deviation. *All differences resulted significant between the groups.