Distribution of samples across different demographic groups

DemographicTotalCognitively normalCognitively impairedP-value
TotalControl (Tested as normal)Normal cognition (Not tested, deemed normal)TotalMCIMild dementiaModerate dementia
Size, n12772601355122617NA
Education group (Mode)College graduate (35%)College graduate (38%)College graduate (47%)Some college (61%)High school graduate (35%)College graduate (58%)High school graduate (46%)High school graduate (35%)< 0.001
Sex (M/F)67/6041/3236/245/827/288/411/158/90.005
Age (SD)80.5 ± 1.672.2 ± 2.377.8 ± 2.680.0 ± 4.983.4 ± 1.981.1 ± 5.383.8 ± 2.584.6 ± 3.5< 0.001

SD: standard deviation