Demographic characteristics of cases and controls
| Cases | Controls | |
| Sex | ||
| Male | 347 (38.6) | 3466 (38.6) |
| Female | 552 (61.4) | 5514 (61.4) |
| Age groups (years) | ||
| 45–54 | 114 (12.68) | 1140 (12.69) |
| 55–64 | 173 (19.24) | 1729 (19.25) |
| 65–74 | 278 (30.92) | 2778 (30.94) |
| 75–84 | 248 (27.59) | 2467 (27.47) |
| 85+ | 86 (9.57) | 866 (9.64) |
| Total | 899 | 8980 |