Table 2.
The risk of dementia type according to the severity of hearing loss.
| Number | Dementia | Duration (year) | IR (per 1000) | Hazard ratio (95% CI) | p value for trend | |
|---|---|---|---|---|---|---|
| Any dementia | ||||||
| ND | 191,202 | 24,326 | 1,331,848.69 | 18.265 | 1 (ref.) | < .0001 |
| Ipsilateral HD | 32,207 | 4254 | 226,679.63 | 18.767 | 1.257 (1.217, 1.299) | |
| Non-severe HD | 86,905 | 16,275 | 571,866.43 | 28.459 | 1.312 (1.286, 1.338) | |
| Severe HD | 72,090 | 10,435 | 489,501.1 | 21.318 | 1.336 (1.306, 1.367) | |
| Alzheimer’s dementia | ||||||
| ND | 191,202 | 18,558 | 1,331,848.69 | 13.93 | 1 (ref.) | < .0001 |
| Ipsilateral HD | 32,207 | 3140 | 226,679.63 | 13.852 | 1.227 (1.181, 1.274) | |
| Non-severe HD | 86,905 | 12,288 | 571,866.43 | 21.488 | 1.302 (1.273, 1.332) | |
| Severe HD | 72,090 | 7904 | 489,501.1 | 16.147 | 1.336 (1.301, 1.372) | |
| Vascular dementia | ||||||
| ND | 191,202 | 2596 | 1,331,848.69 | 1.950 | 1 (ref.) | < .0001 |
| Ipsilateral HD | 32,207 | 499 | 226,679.63 | 2.201 | 1.317 (1.197, 1.450) | |
| Non-severe HD | 86,905 | 1781 | 571,866.43 | 3.114 | 1.353 (1.274, 1.438) | |
| Severe HD | 72,090 | 1145 | 489,501.1 | 2.339 | 1.341 (1.250, 1.438) | |
| Other dementia | ||||||
| ND | 191,202 | 3172 | 1,331,848.69 | 2.382 | 1 (ref.) | < .0001 |
| Ipsilateral HD | 32,207 | 615 | 226,679.63 | 2.713 | 1.381 (1.266, 1.506) | |
| Non-severe HD | 86,905 | 2206 | 571,866.43 | 3.858 | 1.334 (1.263, 1.408) | |
| Severe HD | 72,090 | 1386 | 489,501.1 | 2.831 | 1.331 (1.249, 1.418) | |
ND, non-disability; HD, hearing disability; IR, incidence rate; CI, confidence interval. Duration (years): sum of the observation period.