The prevalence of dementia. A quantitative survey of the literature

NH & MRC Social Psychiatry Research Unit, Australian National University, Canberra.
Acta Psychiatrica Scandinavica (Impact Factor: 5.61). 12/1987; 76(5):465-79. DOI: 10.1111/j.1600-0447.1987.tb02906.x
Source: PubMed


Data from studies of dementia prevalence between 1945 to 1985 were analyzed statistically. Prevalence rates were found to vary as a function of methodological differences between studies. However, despite these differences, the relationship between prevalence and age was found to be consistent across studies, with rates doubling every 5.1 years. Across studies, Alzheimer's disease (AD) was found to be more common in women, with a tendency for multi-infarct dementia (MID) to be more common in men. There were also national differences in the relative prevalence of AD and MID, with MID being more common in Japanese and Russian studies, no difference in Finnish and American studies, and an excess of AD in other Western European countries.

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    • "Collapsing across studies from Europe, North America, Australasia, and Japan, prevalence rates for the five-year age groups from 65 years to 85 and over were found to be 1.4, 2.8, 5.6, 11.1, and 23.6, respectively [59]. A pooling of results from European studies found similar figures [60]. "
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    ABSTRACT: Background: There are only a few reports which provide prevalence rates of mild cognitive impairment (MCI) and dementia specifically in Arabic countries. Objective: This study is aimed at estimating the prevalence of MCI and dementia among subjects aged ≥60 years using door-to-door survey in Qena Governorate/Egypt. Methods: We conducted a door-to-door survey with multistage probability random sampling. Screening of all subjects aged ≥60 years (n = 691) employed a simple questionnaire including changes in memory, behavior, and daily activity as well as the Mini-Mental State Examination. Suspected cases were referred to the hospital for full clinical examination, DSM-IV diagnostic criteria, Hachinski Ischemic Score, neuroimaging, and laboratory investigations if indicated. Results: Of the 691 participants, 12 cases had MCI, giving a crude prevalence rate (CPR) of 1.72/100 and 35 were identified as positive for dementia with a CPR of 5.07/100. The highest age-specific prevalence rates were recorded among subjects ≥85 years old (100/100). The CPRs were significantly higher in urban than rural areas (7.1 versus 3.27/100, respectively; p = 0.03), in industrial areas than non-industrial areas (13.23 versus 1.99; p = 0.00001), and in illiterate than literate participants (10.12 versus 2.25/100; p = 0.00001). Conclusion: Overall, the prevalence rate of MCI and dementia were lower in Qena/Egypt than in other countries. Advanced age, illiteracy, and living in an industrial area were found to be associated with dementia.
    Journal of Alzheimer's disease: JAD 12/2014; 45(1). DOI:10.3233/JAD-142655 · 4.15 Impact Factor
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    • "The relation between age and dementia frequency is highlighted. Jorm and colleagues (1987) demonstrated dementia occurrence ranging from 0.7% of the population below 65 years to 38.6% among the oldest old (>90 years), whereas Ritchie and colleagues (2006) showed rates from 1.5% in 65–69 year olds to 44.5% in those aged 95 years and above. "
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    ABSTRACT: The growing incidence of dementia in ageing societies is a major concern of health care organizations. Because of its detrimental influence on the mental and functional statuses of elderly people, it leads to increased economic burdens caused by the social and financial needs of patients with dementia and their caregivers. There has been no data concerning the prevalence of dementia in the elderly in the general Polish community so far. The main aim of the study was to assess the prevalence of cognitive impairment suspected of dementia among the Polish elderly and the relationships between cognitive performance and age, gender, place of residence and educational status. The presented data was the result of nationwide, multicentre PolSenior Study conducted from 2007 to 2011 in the Polish elderly population. Cognitive functions were evaluated using Mini-Mental State Examination (MMSE) performed by pre-trained nurses. The result of MMSE lower than 24 points was classified as cognitive impairment suspected of dementia and divided according to its severity into three stages: mild, moderate and severe dementia. The results were analysed in two ways: raw MMSE and MMSE scores after Mungas adjustment (MMSEadj), that is, corrected for age and educational level, and these were compared. To verify the suspicion of dementia an assessment was complemented by an interview of carers for the occurrence and course of memory disorders, treatment of dementia and by functional status assessment. In order to assess the prevalence of suspicion of dementia in the general Polish population, statistical analyses based on weighting were done. The suspicion of dementia on the basis of raw MMSE was made in 20.4% of respondents aged 65years and more, and after Mungas adjustment in 12.1% of older subjects. The prevalence of cognitive impairment grew with increasing age, as well as depending on the educational status of elderly respondents in both types of analyses; raw MMSE and MMSEadj. There was no significant difference in the prevalence of cognitive impairment according to gender in the general population (raw MMSE); however in analyses including MMSEadj results, the suspicion of dementia was made more often among men. Suspicion of dementia based on raw MMSE and MMSEadj results was made significantly more often among men than women at the age of 65-69years, and significantly more often among the oldest women, aged 90years and more. Suspicion of dementia was diagnosed more often in respondents living in rural communities (based on raw MMSE, but not on MMSEadj), which might be related to the differences in their educational status.
    Experimental Gerontology 06/2014; 57. DOI:10.1016/j.exger.2014.06.003 · 3.49 Impact Factor
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    • "In the study by Herrera et al. (1998) the percentage of patients with AD increases as the average age rises, going from 0.3% in the elderly 65 to 69 reaching 30.6% in patients of 85 years or more. Like our study, where the average age of the VD was slightly less than the average age of the AD, Jorm et al. (1987) and Hebert et. al. (1998) also observed an accentuation of the relation AD / VD in centenarians, indicating a greater influence of age on the AD cases compared with the VD frames. "
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    ABSTRACT: Dementia syndromes are characterized by the presence of deficit progressive cognitive function. Vascular dementia (VD) is the most prevalent between secondary dementias, ranking second among all dementia after Alzheimer's disease (AD). The aim of this study was to evaluate the cognitive aspects of elderly patients with diagnoses of AD and VD. Participants were 256 elderly patients with mean age of 78 years and both sexes who received a diagnosis of Alzheimer's disease by the Diagnostic Statistic Manual (DSM-IV) and National Institute of Neurological and Communicative Disorders and Stroke and the Alzheimer's Disease and Related Disorders Association (NINCDS-ADRDA). The diagnosis of vascular dementia was done according to National Institute of Neurological Disorders and Stroke (NINDS) and the Association Internationale pour la Recherche et l'Enseignement en Neurosciences (NINCDS-AIREN). The results showed that the prevalence of AD was superior to VD, mean age increases the ratio DA / VD, with women and people with lower education levels most affected. VD and AD patients have had similar cognitive abilities and VD patients exhibit more temporal orientation impairments than AD.
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