TABLE 1.
Characteristics of the study population.
| Age group |
|||||||
| Total | 70–74 | 75–79 | 80–84 | 85–90 | 90–100 | ||
| Participants | n (%) | 1,966 (100) | 600 (30.5) | 654 (33.3) | 465 (23.7) | 182 (9.3) | 65 (3.3) |
| Age | Mean (SD) | 78.0 (5.4) | 72.3 (1.4) | 76.9 (1.4) | 81.7 (1.4) | 86.6 (1.3) | 91.9 (2.3) |
| Gender | Female, % | 59.9 | 56.7 | 62.4 | 58.3 | 62.1 | 69.2 |
| Education (years) | Mean (SD) | 12.3 (2.8) | 12.5 (2.4) | 12.4 (2.5) | 12.4 (3.2) | 11.8 (3.4) | 10.7 (3.3) |
| 12 years or less | % | 68.5 | 67.3 | 69.9 | 65.3 | 72.9 | 75.4 |
| MMSE-J (scores) | Mean (SD) | 26.3 (3.4) | 27.4 (2.4) | 26.6 (3.2) | 25.8 (3.4) | 24.9 (3.8) | 21.9 (5.8) |
| Score 23 or less | % | 16.3 | 7.9 | 13.7 | 21.2 | 27.5 | 50.8 |
| Survey location (venue or home) | Venue, % | 66.0 | 74.5 | 68.5 | 62.2 | 50.0 | 35.4 |
| Neurological symptoms | n | 255 | 48 | 83 | 72 | 41 | 11 |
| History of stroke | n | 178 | 34 | 59 | 55 | 25 | 5 |
| Parkinson’s disease | n | 18 | 4 | 7 | 3 | 4 | 0 |
| Dementia | n | 42 | 6 | 9 | 10 | 11 | 6 |
| Current depression | n | 29 | 5 | 10 | 6 | 5 | 3 |
MMSE-J, Japanese version of the mini-mental state examination.