Abstract
Recent studies have been cautiously optimistic about declining trends in dementia prevalence and incidence. Newly available claims data from a German public health insurance company covering 30% of the total population permitted us to explore short-term trends based on millions of observations up to the highest ages. Diagnoses stemmed from the inpatient and outpatient services and covered both the community-dwelling population and those living in nursing homes. Data spanning more than 3 years were examined, and the examination revealed a significant yearly reduction between 1% and 2% in the prevalence of dementia among women aged 75 to 84 years. The extent of the reduction was comparable with reports from earlier studies. A similar tendency existed among men, however, statistically not significant. Trends in medical, lifestyle, and societal risk factors of dementia may have contributed to this decline.
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