Demographic characteristics
| C9− | C9+ | P value | |
| n | 22 | 38 | – |
| Sex (F/M) | 13/9 | 22/16 | 0.928 |
| Education (secondary/higher education) | 5/17 | 8/30 | 0.879 |
| Age (mean±SD) | 40.3 (11.2) | 38.2 (8.0) | 0.406 |
| Age (range) | 21–61 | 24–56 | – |
| Expected time to disease onset | – | 21.1 (8.4) | – |
| MMSE | 29.0 (1.2) | 28.7 (1.4) | 0.336 |
| FAB | 17.0 (1.4) | 17.3 (0.9) | 0.407 |
FAB, Frontal Assessment Battery; MMSE, Mini-Mental State Examination.