Distribution of samples across different demographic groups

Demographic Total Cognitively normal Cognitively impaired P-value
Total Control (Tested as normal) Normal cognition (Not tested, deemed normal) Total MCI Mild dementia Moderate dementia
Size, n 127 72 60 13 55 12 26 17 NA
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) 67/60 41/32 36/24 5/8 27/28 8/4 11/15 8/9 0.005
Age (SD) 80.5 ± 1.6 72.2 ± 2.3 77.8 ± 2.6 80.0 ± 4.9 83.4 ± 1.9 81.1 ± 5.3 83.8 ± 2.5 84.6 ± 3.5 < 0.001

SD: standard deviation