Table 4. Hazard ratios in the vascular dementia and degenerative dementia groups.

Variables	Basic model		Full model
	HR	95% CI	HR	95% CI
Age (increased 1 year)	1.08	1.07–1.08	1.08	1.07–1.08
Male (ref: female)	1.36	1.30–1.41	1.29	1.24–1.34
Vascular dementia (ref: non-dementia)
No medication	2.90	2.62–3.21	2.46	2.22–2.72
Nootropics	1.50	1.37–1.63	1.25	1.15–1.37
Degenerative dementia (ref: non-dementia)
No medication	2.91	2.76–3.6	2.69	2.55–2.83
Nootropics	1.61	1.53–1.70	1.46	1.39–1.54
Anti-dementia medication	1.06	0.83–1.36	1.05	0.82–1.34
Both medications	0.96	0.84–1.10	0.92	0.80–1.05
Socioeconomic status (ref: low)
Medium			0.99	0.92–1.06
High			0.98	0.92–1.04
Urbanity (ref: urban)
Suburban			1.10	1.05–1.15
Rural			1.19	1.13–1.27
Charlson comorbidity index (increased 1)			1.14	1.13–1.14