Table 2.
Demographic characteristics of the entire sample as well as the subsets of participants that experienced the three critical events. For individual who progressed to AD dementia, only those who had a presumptive etiology of possible or probable Alzheimer’s disease (AD) were included in analyses. MCI = Mild cognitive impairment, NC = Normal cognition, W = White, AA = African American.
| Total Sample | NC all visits | Convert to MCI | Revert to NC | Progress to AD | |
|---|---|---|---|---|---|
| n | 6763 | 5173 | 1121 | 324 | 242 |
| Baseline age (SD) | 72.3 (9.1) | 71.0 (8.8) | 77.0 (8.6) | 74.4 (8.8) | 79.9 (7.8) |
| Sex (% female) | 66.3% | 67.7% | 60.9% | 59.6% | 67.8% |
| Education (SD) | 15.7 (3.0) | 15.9 (3.0) | 15.3 (3.2) | 15.5 (3.2) | 15.3 (3.0) |
| Race | 81%W, 13%AA | 81%W, 14%AA, | 82%W, 13%AA | 78%W, 18%AA | 87%W, 10%AA |
| 5% other | 5% other | 5% other | 4% other | 4% other | |
| Yrs since baseline at event (SD) | NA | NA | 3.4 (2.3) | 4.3 (2.0) | 5.5 (2.2) |
| Follow-up visits at event (SD) | NA | NA | 2.9 (2.1) | 3.7 (1.7) | 4.8 (2.1) |
| Total follow-up length (SD) | 5.4 (2.5) | 5.3 (2.5) | 6.2 (2.3) | 6.6 (2.3) | 6.8 (2.2) |
| Total follow-up visits (SD) | 4.8 (2.3) | 4.6 (2.3) | 6.0 (2.5) | 5.9 (2.2) | 6.0 (2.2) |