Table 3.

Multivariate Cox regression analysis for the impact of disaster on cognitive decline among participants who are aged over 85

		Whole participants
		All		Home residents		Facility residents
		H.R.	95% C.I.	H.R.	95% C.I.	H.R.	95% C.I.
Victims (ref = non-victims)		1.13	0.97–1.31	1.23	1.04–1.45	0.85	0.60–1.20
Age (ref = 85–89)	90–94	1.08	1.04–1.12	1.10	1.05–1.15	1.02	0.96–1.09
	over 95	1.18	1.12–1.23	1.27	1.19–1.36	1.04	0.96–1.12
Female (ref = male)		0.95	0.91–0.98	0.94	0.89–0.98	0.99	0.92–1.06
Level of dementia symptomatology assessment before disaster (ref = II b)	Independent	1.65	1.56–1.75	1.62	1.52–1.73	2.21	1.94–2.51
	I	1.27	1.21–1.33	1.24	1.17–1.31	1.49	1.35–1.64
	II a	1.36	1.29–1.42	1.39	1.30–1.48	1.31	1.20–1.43
	III a	0.61	0.58–0.65	0.72	0.67–0.78	0.53	0.49–0.58
	III b	0.52	0.48–0.57	0.62	0.55–0.71	0.47	0.42–0.52
	IV	0.10	0.09–0.12	0.15	0.12–0.19	0.08	0.07–0.10
Use of facilities that were shut down after the disaster (ref = none)		1.28	1.18–1.39	1.33	1.21–1.46	1.11	0.95–1.30
Population density (per 1000/km2)		0.98	0.97–0.99	0.98	0.97–0.99	0.99	0.97–1.01
Facility residents (ref = home residents)		1.36	1.31–1.41

H.R., hazard ratio; C.I., confidence interval