<unk>  is the second-most-common form of dementia after Alzheimer's disease (AD) in older adults. The prevalence of the illness is 1.5% in Western countries and approximately 2.2% in Japan. It accounts for 50% of all dementias in Japan, 20% to 40% in Europe and 15% in Latin America. 25% of stroke patients develop new-onset dementia within one year of their stroke. One study found that in the United States, the prevalence of<unk>  in all people over the age of 71 is 2.43%, and another found that the prevalence of the dementias doubles with every 5.1 years of age. The incidence peaks between the fourth and the seventh decades of life and 80% of patients have a history of hypertension. A recent meta-analysis identified 36 studies of prevalent stroke (1.9 million participants) and 12 studies of incident stroke (1.3 million participants). For prevalent stroke, the pooled hazard ratio for all-cause dementia was 1.69 (95% confidence interval: 1.49–1.92; P 2 = 87%). For incident stroke, the pooled risk ratio was 2.18 (95% confidence interval: 1.90–2.50; P 2 = 88%). Study characteristics did not modify these associations, with the exception of sex, which explained 50.2% of between-study heterogeneity for prevalent stroke. These results confirm that stroke is a strong, independent, and potentially modifiable risk factor for all-cause dementia.
Vascular dementia
Dementia with Lewy bodies  Dementia with Lewy bodies  1
Alcohol-related dementia
Subcortical dementia
Depression of Alzheimer disease
Early-onset Alzheimer's disease
Semantic dementia
Alzheimer's disease