Table 2.
Sample demographic characteristics and longitudinal follow-up (N = 1746)
| Characteristic | Overall sample | ACS | AIBL | BIOCARD | BLSA | WRAP |
|---|---|---|---|---|---|---|
| Sample size | 1746 | 360 | 767 | 301 | 147 | 171 |
| Number of visits, mean (SD) | 4.4 (2.8) | 3.5 (2.3) | 3.5 (0.9) | 7.0 (2.9) | 7.7 (4.9) | 3.4 (1.1) |
| Years of follow-up, mean (SD) | 6.6 (4.9) | 4.4 (3.3) | 3.9 (1.5) | 11.3 (4.3) | 14.4 (6.7) | 8.2 (1.7) |
| Age at recruitment, mean (SD) | 64.0 (9.6) | 60.4 (8.1) | 70.0 (7.0) | 58.1 (8.6) | 63.5 (10.1) | 55.3 (5.9) |
| Years of education, mean (SD) | 16.2 (2.5) | 16.0 (2.5) | 14.7 (1.6) | 17.0 (2.4) | 16.9 (2.2) | 15.6 (2.6) |
| Female sex, N (%) | 1033 (59.2) | 231 (64.2) | 439 (57.3) | 177 (58.8) | 72 (49.0) | 114 (66.7) |
| White race, N (%) | 1655 (94.8) | 313 (86.9) | 767 (100) | 310 (96.6) | 117 (79.6) | 168 (98.2) |
Abbreviations: ACS, Adult Children Study; AIBL, Australian Imaging, Biomarker, and Lifestyle; BLSA, Baltimore Longitudinal Study of Aging; SD, standard deviation; WRAP, Wisconsin Registry for Alzheimer's Prevention.