Table 4.
Multivariate Poisson regression model on the incidence and prevalence rates of dementia in Taiwan from 2004–2010.
| Variables | Incidence rates | Prevalence rates | ||||||
|---|---|---|---|---|---|---|---|---|
| Crude IRR† | 95% CI† | Adjusted IRR† | 95% CI† | Crude PRR† | 95% CI† | Adjusted PRR† | 95% CI† | |
| Year (ref. = 2004)† | ||||||||
| 2005 | 0.99 | 0.98–1.01 | 0.98 | 0.96–1.00 | 1.14∗ | 1.13–1.15 | 1.12∗ | 1.11–1.13 |
| 2006 | 1.03∗ | 1.01–1.05 | 1.01 | 0.99–1.02 | 1.29∗ | 1.28–1.30 | 1.24∗ | 1.23–1.25 |
| 2007 | 1.05∗ | 1.03–1.07 | 1.02 | 0.98–1.02 | 1.43∗ | 1.42–1.43 | 1.35∗ | 1.34–1.36 |
| 2008 | 1.04∗ | 1.02–1.06 | 1.00 | 1.00–1.03 | 1.56∗ | 1.55–1.57 | 1.45∗ | 1.44–1.46 |
| 2009 | 1.06∗ | 1.04–1.08 | 1.01 | 0.99–1.02 | 1.69∗ | 1.68–1.70 | 1.55∗ | 1.54–1.56 |
| 2010 | 1.05∗ | 1.04–1.07 | 0.98∗ | 0.97–1.00 | 1.82∗ | 1.81–1.84 | 1.63∗ | 1.61–1.64 |
| Trend test | β = 0.0105, p < 0.0001 | β = −0.0012, p=0.9437 | β = 0.0972, p < 0.0001 | β = 0.0784, p < 0.0001 | ||||
|
| ||||||||
| Age (ref. = 65–69)† | ||||||||
| 70–74 | 2.01∗ | 1.98–2.05 | 2.01∗ | 1.98–2.05 | 1.99∗ | 1.97–2.20 | 1.98∗ | 1.97–2.00 |
| 75–79 | 3.55∗ | 3.50–3.61 | 3.58∗ | 3.52–3.64 | 3.69∗ | 3.66–3.71 | 3.71∗ | 3.68–3.73 |
| 80–84 | 5.46∗ | 5.37–5.55 | 5.51∗ | 5.42–5.60 | 6.14∗ | 6.09–6.18 | 6.08∗ | 6.04–6.12 |
| ≥85 | 7.58∗ | 7.45–7.71 | 7.58∗ | 7.45–7.71 | 10.88∗ | 10.81–10.96 | 10.64∗ | 10.56–10.71 |
| Trend test | β = 0.4907, p < 0.0001 | β = 0.4913, p < 0.0001 | β = 0.5799, p < 0.0001 | β = 0.5732, p < 0.0001 | ||||
|
| ||||||||
| Sex (ref. = male)† | ||||||||
| Female | 1.11∗ | 1.10–1.12 | 1.15∗ | 1.14–1.16 | 1.10∗ | 1.09–1.11 | 1.11∗ | 1.09–1.12 |
†IRR, incidence rate ratio; PRR, prevalence rate ratio; CI, confidence interval; Ref., reference. ∗p < 0.05.