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The association between intelligence and lifespan is mostly genetic

Arden, Rosalind and Luciano, Michelle and Deary, Ian J. and Reynolds, Chandra A. and Pedersen, Nancy L. and Plassman, Brenda L. and McGue, Matt and Christensen, Kaare and Visscher, Peter M. (2015) The association between intelligence and lifespan is mostly genetic. International Journal of Epidemiology, 45 (1). pp. 178-185. ISSN 0300-5771

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Identification Number: 10.1093/ije/dyv112

Abstract

Background: Several studies in the new field of cognitive epidemiology have shown that higher intelligence predicts longer lifespan. This positive correlation might arise from socioeconomic status influencing both intelligence and health; intelligence leading to better health behaviours; and/or some shared genetic factors influencing both intelligence and health. Distinguishing among these hypotheses is crucial for medicine and public health, but can only be accomplished by studying a genetically informative sample. Methods: We analysed data from three genetically informative samples containing information on intelligence and mortality: Sample 1, 377 pairs of male veterans from the NAS-NRC US World War II Twin Registry; Sample 2, 246 pairs of twins from the Swedish Twin Registry; and Sample 3, 784 pairs of twins from the Danish Twin Registry. The age at which intelligence was measured differed between the samples. We used three methods of genetic analysis to examine the relationship between intelligence and lifespan: we calculated the proportion of the more intelligent twins who outlived their co-twin; we regressed within-twin-pair lifespan differences on within-twin-pair intelligence differences; and we used the resulting regression coefficients to model the additive genetic covariance. We conducted a meta-analysis of the regression coefficients across the three samples. Results: The combined (and all three individual samples) showed a small positive phenotypic correlation between intelligence and lifespan. In the combined sample observed r = .12 (95% confidence interval .06 to .18). The additive genetic covariance model supported a genetic relationship between intelligence and lifespan. In the combined sample the genetic contribution to the covariance was 95%; in the US study, 84%; in the Swedish study, 86%, and in the Danish study, 85%. Conclusions: The finding of common genetic effects between lifespan and intelligence has important implications for public health, and for those interested in the genetics of intelligence, lifespan or inequalities in health outcomes including lifespan.

Item Type: Article
Official URL: http://ije.oxfordjournals.org/
Additional Information: © 2015 The Authors © CC BY 4.0
Subjects: B Philosophy. Psychology. Religion > BF Psychology
H Social Sciences > H Social Sciences (General)
Q Science > QH Natural history > QH426 Genetics
Sets: Research centres and groups > Centre for Philosophy of Natural and Social Science (CPNSS)
Date Deposited: 18 Jul 2016 11:23
Last Modified: 18 Jul 2016 11:36
URI: http://eprints.lse.ac.uk/id/eprint/67154

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