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Accounting for the relationship between low education and dementia: a twin study.

Artikel i vetenskaplig tidskrift
Författare M Gatz
J Mortimer
L Fratiglioni
Boo Johansson
S Berg
R Andel
M Crowe
A Fiske
C.A Reynolds
N.L. Pedersen
Publicerad i Physiol Behav
Sidor 232-237
Publiceringsår 2007
Publicerad vid Psykologiska institutionen
Sidor 232-237
Språk en
Ämneskategorier Psykologi

Sammanfattning

We evaluated whether the association between low education and greater risk of dementia is explained by genetic influences, using three different types of analyses. The HARMONY study (Swedish for "health" (Hälsa), "genes" (ARv), "environment" (Miljö), "and" (Och), and "new" (NY)) includes members of the Swedish Twin Registry who were aged 65 and older and alive in 1998, and who were screened and clinically assessed for dementia. There were 394 cases with dementia and 7786 unrelated controls. Analyses included co-twin control, tests for association between education and a measured genotype, and bivariate twin modeling. Low education was a significant risk factor for dementia both in case-control analyses (odds ratio=1.77, 95% confidence interval 1.38 to 2.28) and co-twin control analyses with monozygotic twin pairs (odds ratio=3.17, 95% confidence interval 1.26 to 7.93). Apolipoprotein E genotype was not associated with education and did not account for the relationship between education and dementia. Bivariate twin modeling showed that the association between education and dementia was not mediated by genetic influences in common between education and dementia. The association was mediated by shared environmental influences that were related to both dementia and to education. Low education is confirmed as a risk factor for dementia. Findings from three different analytic approaches showed that genetic influences did not explain this association.

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