Table 1. Summary of population characteristics at baseline.
| Education | ||||||
| 0–9 years | 10–11 years | >11 years | ||||
| (n = 7,884) | (n = 2,673) | (n = 1,913) | ||||
| Age (s.d.) | 75.3 | (7.0) | 74.7 | (6.6) | 75.2 | (6.7) |
| Sex – n (%) | ||||||
| Male | 3236 | (41.0) | 1023 | (38.1) | 767 | (40.0) |
| Female | 4648 | (59.0) | 1650 | (61.9) | 1146 | (60.0) |
| Mid-life occupation complexity – n (%) | ||||||
| Tertile 1 (Low) | 3571 | (45.3) | 898 | (33.6) | 409 | (21.4) |
| Tertile 2 (Medium) | 2814 | (35.7) | 804 | (30.1) | 332 | (17.4) |
| Tertile 3 (High) | 1499 | (19.0) | 971 | (36.3) | 1172 | (61.3) |
| Late-life social engagement – n (%) | ||||||
| Tertile 1 (Low) | 2926 | (37.1) | 949 | (35.6) | 682 | (35.7) |
| Tertile 2 (Medium) | 2383 | (30.2) | 780 | (29.2) | 552 | (28.9) |
| Tertile 3 (High) | 2575 | (32.7) | 944 | (35.3) | 679 | (35.5) |
| MMSE group – n (%) | ||||||
| No impairment (27–30) | 3616 | (45.9) | 1599 | (59.8) | 1383 | (72.3) |
| Mild impairment (23–26) | 2688 | (34.1) | 785 | (29.4) | 411 | (21.5) |
| Moderate-to-severe impairment (0–22) | 1580 | (20.0) | 289 | (10.8) | 119 | (6.2) |