10 With regard to dementia subtypes, an increasing trend in the prevalence of AD was observed (1.4%, 1.8%, 3.4%, 6.1%, and 12.3%, respectively; P for trend <0.01), while the prevalence of VaD showed a decreasing trend between 1985 and 1998 and thereafter an increasing trend (2.4%, 1.9%, 1.7%, 3.3%, 3.0%, respectively; P for trend = 0.02).
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