Table 1.
Subject Demographics
| Characteristic | Summary |
| Number of subjects | 278 |
| Sex, n (%) | |
| Female | 108 (39%) |
| Male | 170 (61%) |
| Age at baseline PET, y | 75 (70, 79) [51, 93] |
| Education, years | 15 (12, 17) [0, 24] |
| Global cortical PIB, SUVR | 1.39 (1.31, 2.02) [1.13, 3.20] |
| Diagnosis at baseline, n (%) | |
| CU | 179 (64%) |
| MCI | 62 (22%) |
| Dementia | 37 (13%) |
| APOE ɛ4, n (%) | |
| Carrier | 102 (37%) |
| Non-carrier | 176 (63%) |
| MMSE score | 28 (27, 29) [8, 30] |
| Time between first and | 3.7 (2.5, 4.1) [1.6, 5.7] |
| third scan, y | |
| Time between corresponding | 7 (1, 20) [0, 148] |
| MRI and PET scans, daysa |
Values are given as: median (1st quartile, 3rd quartile) [min to max] or number (percent) n, number of subjects; CU, clinically unimpaired; MCI, mild cognitive impairment; APOE, apolipoprotein E; MMSE, Mini-Mental State Examination. aBased on all scans for all individuals.