Table 1.
Demographic and Clinical Characteristics of the Legacy Studies at the Most Recent Study Visit
| Variable | ACT | ADNI | ROS | MAP |
|---|---|---|---|---|
| Sample size, n | 5,546 | 3,016 | 1,456 | 2,163 |
| Age, mean (SD) | 81.9 (7.8) | 74.9 (8.7) | 85.8 (7.4) | 86.0 (7.9) |
| Female, (%) | 58.2 | 48.1 | 71.6 | 73.5 |
| Education, mean (SD) | 14.9 (3.2) | 16.1 (2.8) | 18.4 (3.3) | 14.9 (3.3) |
| Self-reported race, % | ||||
| Non-Latinx White | 88.8 | 88.1 | 89.6 | 88.5 |
| African/American | 3.6 | 4.6 | 5.7 | 5.2 |
| Hispanic/Latino | 1.1 | 3.7 | 4.3 | 5.5 |
| Others | 6.5 | 3.6 | 0.4 | 0.8 |
| Cognitive diagnosis at most recent visit, % | ||||
| Cognitively normal | 92.2 | 38.3 | 42.2 | 50.4 |
| Mild Cognitive Impairment (MCI) | N/Aa | 32.0 | 23.0 | 23.7 |
| Diagnosed with AD | 6.0 | 29.7 | 33.4 | 24.5 |
| Other dementia | 1.8 | N/A | 1.4 | 1.4 |
Note. ACT = adult changes in thought; ADNI = Alzheimer’s Disease Neuroimaging Initiative; ROS = Religious Orders Study; MAP = Memory and Aging Project; AD = Alzheimer’s disease; SD = standard deviation. A few individuals were missing some of these demographic characteristics.
a
In ACT, MCI as a diagnosis is generally not made.