Demographic and clinical characteristics of MCI and control subjects.

Columns present group characteristics (mean ± standard error of the mean). “M” stands for men, “W,” for women. Educational status was determined by 3 categories: 1 – primary/secondary school without or with short (3 years); 3– high school and tertiary education.*stands for the contrast sMCI>mMCI;**for controls>sMCI, and ***controls>mMCI. “NS” stands for “not significant” (P≥.05, non-parametric ANOVA with three levels and χ2 test with Bonferroni correction for the three pairs of comparisons). We applied 10000 permutations to estimate the distributions of the t-contrasts. There were no significant differences between any aMCI subgroups for the parameters presented in the table.