Table 1.
Sample characteristics (n = 157 pairs).
| Cases (n = 157) | Controls (n = 157) | ||
|---|---|---|---|
| Age (years)1 | 78 ± 6.1 (65–92) | 77.9 ± 6.1 (65–92) | |
| Women | 89 (56.7) | 82 (52.2) | |
| Men | 68 (43.3) | 75 (47.8) | |
| Education (years) | 7.8 ± 2.6 (2–16) | 8 ± 2.6 (0–16) | |
| Physical activity2 | 1 ± 1 (0–3) | 1.4 ± 1 (0–3) | |
| Zygotic status | |||
| Monozygotic | 39 (24.8) | ||
| Same-sex dizygotic | 67 (42.7) | ||
| Opposite sex dizygotic | 49 (31.2) | ||
| Indeterminate | 2 (1.3) | ||
| Clinical diagnoses | |||
| Dementia | 104 (66.2) | ||
| Cognitive impairment | 53 (33.8) | ||
| Cognitively intact | 157 (100) |
Data are n (%) or means ± SD (range).
1Mean age excludes pairs where control was not assessed in person due to death (n = 7 pairs).
2Physical activity was assessed using a 0–3 scale, where 0 is no activity and 3 is frequent activity.