الفهرس 
epidemologyOnly 14 pages are availabe for public view
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Abstract
Dementia is a serious neuropsychiatric, social and economic problem. At needs, a lot of epidemiological studies to extend the knowledge of this problem. Worldwide epidemiological studies have shown a wide variation in the prevalence of dementia. Expansion of the world’s elde.rly populations has increased concerns about aging related medical disorders like Alzheimer’s disease, vascular. dementia and other dementias. In the United States, one’, fourth of those older than age 65 and at greatest risk for deve loping dementia live in rural environments that may influence its manifestation ( Keefover et al., 1996). The concept of ”cognitive impairment,” as an indicator of dementia, defined in 1980, as a 1oss of intellectual abilities of suffici6nt severity to interfere with social or occupational functioning, is the model that has been adopted for a condition, which has ’recently been reclassified from an organic” to a ”cognitive disorder.” Data derived, from the assessment of a sample’ of older people ’demonstrated the extreme, sensitivity of a widely employed assessment instrument to all levels of educational experience, and educational correlates, notably level of physical disability, were identified as other independent predictors of test performance.