Baseline Demographic, clinical, and neuroimaging characteristics of study participants.

<p>Abbreviations: NC, normal control; MCI, mild cognitive impairment; AD, Alzheimer's disease; n, number; CDRSB, Clinical Dementia Rating scale sum of boxes; ADAS, Alzheimer's disease Assessment Scale; MMSE, Mini-Mental State Exam; RAVLT, Rey Auditory Verbal Learning Test; FAQ, Functional Activities Questionnaire</p><p>∧For CDRSB score, the sample size: NC = 210; °For ADAS11 scores and MMSE scores, the sample size: MCI = 345; *For ADAS13 scores, the sample size: MCI = 342, AD = 158; ^£For RAVLT total scores, the sample size: NC = 210, MCI = 345, AD = 161; ^§For FAQ scores, the sample size: MCI = 344; **For Hippocampus volume, the sample size: NC = 193, MCI = 293, AD = 133; ^#the sample size: NC = 108, MCI = 176, AD = 88</p><p>P values for continuous variables are from one-way ANOVA; P values for categorical data are from Spearman's correlation analysis.</p><p>Baseline Demographic, clinical, and neuroimaging characteristics of study participants.