Table 1: Descriptive characteristics of cases and controls.
| Variable | Family study (NIA sample) | Case-control study (Canadian sample) | ||
|---|---|---|---|---|
| Patients | Controls | Patients | Controls | |
| Sample size (n) | 1266 | 1279 | 791 | 782 |
| Mean of age at onset (years ± SD) | 76.4 (± 6.7) | - | 72.3 (± 8.5) | - |
| Median of age at onset (years) | 77 | - | 73 | - |
| Range of age at onset (years) | 50-98 | - | 40-97 | - |
| Mean age at entry (years ± SD) | - | 75.5 (± 8.1) | 77.6 (± 8.6) | 73.4 (± 7.9) |
| Median age at entry (years) | - | 75 | 79 | 79 |
| Range of age at entry (years) | - | 42 - 103 | 43 - 100 | 48 - 94 |