Table 1. Characteristics of the study sample.
| Characteristics | |
|---|---|
| Number of cases with AD | 11 840 |
| Number of controls | 10 931 |
| Age at Onset for AD cases (s.d.) | 74.55 (6.8) |
| Age at last exam for controls (s.d.) | 76.26 (7.2) |
| Proportion of females | 59.66% |
| Frequency of APOE e4+ | |
| Cases | 0.38 |
| Controls | 0.14 |
| Frequency of APOE e4− | |
| Cases | 0.62 |
| Controls | 0.86 |
Abbreviation: AD, Alzheimer's disease; APOE, apolipoprotein E.