Table 1.
Demographic Characteristics of 1666 Individuals at Risk
| Characteristic | NIA-LOAD/NCRAD Families (n = 983) | EFIGA Families (n = 683) |
|---|---|---|
| Age, mean (SD), ya | 71.0 (9.9) | 69.6 (9.1) |
| Educational level, mean (SD), yb | 14.1 (10.9) | 7.9 (5.3) |
| Women, % | 63 | 65 |
| Person-years at risk, mean (SD) | 3.9 (2.0) | 4.3 (2.9) |
| APOE allele distribution, ε2/ε3/ε4, % | 5.0/69.0/26.0 | 4.5/69.5/26.0 |
Abbreviations: EFIGA, Estudio Familiar de Influencia Genetica en Alzheimer; NIA-LOAD/NCRAD, National Institute on Aging Genetics Initiative for Late-Onset Alzheimer Disease/National Cell Repository for Alzheimer Disease.
a
The NIA-LOAD/NCRAD individuals were significantly older than the EFIGA individuals (P = .004).
b
The NIA-LOAD individuals had significantly more years of education than the EFIGA individuals (P < 2 × 10−16).