Table 2.
Multivariate Cox regression analysis for the impact of disaster on cognitive decline
| Whole participants | Re-certified participants | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| All | Home residents | Facility residents | All | Home residents | Facility residents | ||||||||
| H.R. | 95% C.I. | H.R. | 95% C.I. | H.R. | 95% C.I. | H.R. | 95% C.I. | H.R. | 95% C.I. | H.R. | 95% C.I. | ||
| Victims (ref = non-victims) | 1.12 | 1.00a–1.26 | 1.20 | 1.06–1.36 | 0.89 | 0.67–1.17 | 1.08 | 0.97–1.21 | 1.13 | 1.00b–1.28 | 0.91 | 0.69–1.21 | |
| Age (ref = < 64) | 65–74 | 1.65 | 1.43–1.91 | 1.69 | 1.44–1.99 | 1.36 | 0.98–1.89 | 1.63 | 1.41–1.88 | 1.68 | 1.44–1.99 | 1.22 | 0.88–1.70 |
| 75–84 | 2.16 | 1.88–2.48 | 2.29 | 1.96–2.67 | 1.48 | 1.08–2.04 | 2.09 | 1.82–2.41 | 2.26 | 1.93–2.64 | 1.28 | 0.93–1.75 | |
| 85 > | 2.54 | 2.20–2.91 | 2.83 | 2.42–3.30 | 1.49 | 1.09–2.05 | 2.45 | 2.13–2.81 | 2.78 | 2.38–3.25 | 1.30 | 0.94–1.78 | |
| Female (ref = male) | 0.93 | 0.91–0.96 | 0.93 | 0.90–0.97 | 0.96 | 0.91–1.02 | 0.96 | 0.93–0.99 | 0.96 | 0.93–0.99 | 0.99 | 0.94–1.05 | |
| Level of dementia symptomatology assessment before disaster (ref = II b) | Independent | 1.38 | 1.32–1.44 | 1.35 | 1.29–1.42 | 1.96 | 1.77–2.17 | 1.45 | 1.39–1.51 | 1.46 | 1.39–1.53 | 1.74 | 1.57–1.92 |
| I | 1.19 | 1.14–1.23 | 1.14 | 1.09–1.19 | 1.50 | 1.39–1.62 | 1.20 | 1.15–1.25 | 1.18 | 1.13–1.24 | 1.35 | 1.25–1.46 | |
| II a | 1.33 | 1.28–1.39 | 1.33 | 1.26–1.39 | 1.35 | 1.26–1.46 | 1.36 | 1.31–1.42 | 1.39 | 1.32–1.46 | 1.31 | 1.21–1.41 | |
| III a | 0.63 | 0.60–0.66 | 0.74 | 0.70–0.78 | 0.55 | 0.51–0.58 | 0.65 | 0.63–0.68 | 0.73 | 0.69–0.78 | 0.58 | 0.55–0.62 | |
| III b | 0.54 | 0.51–0.58 | 0.66 | 0.60–0.73 | 0.48 | 0.43–0.52 | 0.56 | 0.52–0.60 | 0.64 | 0.58–0.70 | 0.51 | 0.46–0.55 | |
| IV | 0.12 | 0.10–0.13 | 0.18 | 0.16–0.21 | 0.09 | 0.08–0.10 | 0.13 | 0.11–0.14 | 0.18 | 0.15–0.21 | 0.10 | 0.09–0.12 | |
| Use of facilities that were shut down after the disaster (ref = none) | 1.31 | 1.23–1.40 | 1.34 | 1.24–1.44 | 1.19 | 1.05–1.35 | 1.20 | 1.13–1.28 | 1.18 | 1.09–1.26 | 1.24 | 1.10–1.41 | |
| Population density (per 1000/km2) | 0.98 | 0.97–0.98 | 0.97 | 0.96–0.98 | 1.00 | 0.99–1.01 | 1.02 | 1.01–1.03 | 1.02 | 1.02–1.03 | 1.02 | 1.00–1.03 | |
| Facility residents (ref = home residents) | 1.45 | 1.41–1.50 | 1.59 | 1.54–1.64 | |||||||||
H.R., hazard ratio; C.I., confidence interval
aThe lower limit of the 95% C.I. is 1.0018 rounded off to the third decimal
bThe lower limit of the 95% C.I. is 1.0004 rounded off to the third decimal