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Does Cognitive Status Modify the Relationship Between Education and Mortality? Evidence from the Canadian Study of Health and Aging

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  • Jamie C. Brehaut
  • Parminder Raina
  • Joan Lindsay
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    Abstract

    Background: There is compelling evidence of an inverse relationship between level of education and increased mortality. In contrast to this, one study showed that among subjects with Alzheimer's Disease, those with high education are more than twice as likely to die earlier; however, this result has proven difficult to replicate. We examine the relationship between education and mortality by cognitive status using a large, nationally representative sample of elderly. Methods: A representative sample of 10,263 people aged 65 or over from the 10 Canadian provinces participated in the Canadian Study of Health and Aging in 1991. Information about age, gender, education, and an initial screening for cognitive impairment were collected; those who screened positive for cognitive impairment were referred for a complete clinical and neuropsychological examination, from which cognitive status and clinical severity of dementia were assessed. Vital status and date of death were collected at follow-up in 1996. The analysis was conducted using survival analysis. Findings: Cognitive status modifies the relationship between education and mortality. For those with no cognitive impairment, an inverse relationship between education and mortality exists. Elderly with cognitive impairment but no dementia, or those with dementia, are more likely to die early than the cognitively normal at baseline, but no relationship exists between education and mortality. Interpretation: These findings do not support previous work that showed a higher risk of mortality among highly educated dementia subjects.

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    File URL: http://socserv.mcmaster.ca/sedap/p/sedap80.pdf
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    Bibliographic Info

    Paper provided by McMaster University in its series Social and Economic Dimensions of an Aging Population Research Papers with number 80.

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    Length: 39 pages
    Date of creation: Sep 2002
    Date of revision:
    Handle: RePEc:mcm:sedapp:80

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    Keywords: Alzheimer disease; cognition; dementia; education; epidemiology; etiology; mortality;

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    1. Mustard, Cameron A. & Derksen, Shelley & Berthelot, Jean-marie & Wolfson, Michael & Roos, Leslie L., 1997. "Age-specific education and income gradients in morbidity and mortality in a Canadian province," Social Science & Medicine, Elsevier, vol. 45(3), pages 383-397, August.
    2. Backlund, Eric & Sorlie, Paul D. & Johnson, Norman J., 1999. "A comparison of the relationships of education and income with mortality: the national longitudinal mortality study," Social Science & Medicine, Elsevier, vol. 49(10), pages 1373-1384, November.
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    Cited by:
    1. Tamura, Robert, 2006. "Human capital and economic development," Journal of Development Economics, Elsevier, vol. 79(1), pages 26-72, February.

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