Table 1. Demographic characteristics of participants and diagnostic procedures of dementia in five prevalence surveys.
| Year of survey | |||||
| 1985 (n = 887) |
1992 (n = 1,189) |
1998 (n = 1,437) |
2005 (n = 1,566) |
2012 (n = 1,904) |
|
| Age, years, mean (SD) | 74 (6) | 74 (7) | 75 (7) | 76 (7) | 76 (8) |
| Women, % | 60.2 | 60.1 | 60.3 | 60.9 | 59.0 |
| Participation rate, % | 94.6 | 96.6 | 99.7 | 91.5 | 93.5 |
| Neuropsychological test | HDS | HDS | HDS-R | HDS-R | HDS-R |
| HDS-R | MMSE | MMSE | |||
| MMSE | |||||
| Diagnosis of dementia | DSM-III | DSM-III-R | DSM-III-R | DSM-III-R | DSM-III-R |
DSM-III, Diagnostic and Statistical Manual of Mental Disorders, third edition; DSM-III-R, Diagnostic and Statistical Manual of Mental Disorders, revised third edition; HDS, Hasegawa’s Dementia Rating Scale; HDS-R, Hasegawa’s Dementia Rating Scale, revised version; MMSE, Mini-Mental State Examination; SD, standard deviation.