Age and dementia effect on neuropsychological test performance in very old age--influence of risk factors for dementia.

Abstract excerpt

In old age a large part of the variance in cognitive performance in population samples is explained by normal aging; in addition many subjects over 80 years are demented and therefore dementia also explains a part of cognitive variability. The question is whether the different factors for dementia (such as ApoE4, external atrophy parameter of the cranial computer tomography [cCT], education, sex or serum zinc...

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