Participant demographic characteristics.

Note: Values are mean ± SD unless otherwise indicated. NC, normal control; AD, Alzheimer's Disease; MCInc, mild cognitive impairment patients who have not converted to AD within 24 months; MCIc, mild cognitive impairment patients who have converted to AD within 24 months; ApoE, apolipoprotein E; MMSE, Mini-Mental State Examination; CDR, Clinical Dementia Rating.aTwo sample t-test for all comparisons between NC and AD groups except sex and ApoE ε4 carriers, where Pearson's chi-square tests were used.bTwo sample t-test for all comparisons between MCInc and MCIc groups except sex and ApoE ε4 carriers, where Pearson's chi-square tests were used.