Table 1. Characteristics of the study population.
| N (%) | 4135 | (100) |
| Gender, N (%) | ||
| Women | 1978 | (48) |
| Men | 2157 | (52) |
| Ethnicity | ||
| European | 3963 | (96) |
| Other | 172 | (4) |
| Age, mean (SD), y | 55 | (12) |
| Age, N (%), y | ||
| 35–44 | 920 | (22) |
| 45–54 | 1277 | (31) |
| 55–64 | 1002 | (24) |
| 65–74 | 691 | (17) |
| ≥75 | 245 | (6) |
| Educational level, N (%) | ||
| Primary school | 406 | (10) |
| Lower secondary education | 1225 | (29) |
| Higher secondary education | 1108 | (27) |
| University | 1396 | (34) |
| APOE ε4 genotype, N (%) | ||
| All | 3855 | (93) |
| Homozygous carrier (ε4/ε4) | 101 | (2) |
| Heterozygous carrier (ε2/ε4 or ε3/ε4) | 1065 | (26) |
| Noncarrier | 2689 | (65) |
| RFFT score, mean (SD) | 69 | (26) |