Table 1.
General characteristics of participants
| Characteristics | Total participants | ||
| Dementia (n, %) | Control group (n, %) | P value | |
| Age (years old) | 1.000 | ||
| 60–64 | 580 (5.1) | 2320 (5.1) | |
| 65–69 | 1289 (11.3) | 5156 (11.3) | |
| 70–74 | 2325 (20.3) | 9300 (20.3) | |
| 75–79 | 2979 (26.0) | 11 916 (26.0) | |
| 80–84 | 2703 (23.6) | 10 812 (23.6) | |
| 85+ | 1566 (13.7) | 6264 (13.7) | |
| Sex | 1.000 | ||
| Male | 3663 (32.0) | 14 652 (32.0) | |
| Female | 7779 (68.0) | 31 116 (68.0) | |
| Income | 1.000 | ||
| 1 (lowest) | 2866 (25.0) | 11 464 (25.0) | |
| 2 | 1034 (9.0) | 4136 (9.0) | |
| 3 | 1374 (12.0) | 5496 (12.0) | |
| 4 | 1884 (16.5) | 7536 (16.5) | |
| 5 (highest) | 4284 (37.4) | 17 136 (37.4) | |
| Region of residence | 1.000 | ||
| Urban | 4623 (40.4) | 18 492 (40.4) | |
| Rural | 6819 (59.6) | 27 276 (59.6) | |
| Hypertension | 8316 (72.7) | 33 264 (72.7) | 1.000 |
| Diabetes | 4065 (35.5) | 16 260 (35.5) | 1.000 |
| Dyslipidaemia | 3554 (31.1) | 14 216 (31.1) | 1.000 |
| Ischaemic heart disease | 1707 (14.9) | 6118 (13.4) | <0.001* |
| Cerebral stroke | 5518 (48.2) | 11 390 (24.9) | <0.001* |
| Depression | 3231 (28.2) | 4782 (10.4) | <0.001* |
| COPD | 1273 (11.1) | 4419 (9.7) | <0.001* |
| Asthma | 2587 (22.6) | 10 229 (22.3) | 0.551 |
*χ2 test. Significance at p<0.05.
COPD, chronic obstructive pulmonary disease.