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Childhood socio-economic status modifies the association between intellectual abilities at age 20 and mortality in later life

Record type: Article

Background: People who score poorly in intellectual ability tests have shorter life expectancy. We studied whether this association is different in people from different socio-economic backgrounds.

Methods: We studied the mortality of 2786 men born in Helsinki, Finland, during 1934-44, who as military conscripts underwent a standardised intellectual ability test comprising verbal, visuospatial and arithmetic reasoning subtests. Mortality data came from the Finnish Death Register.

Results: Comparing men in the lowest and highest test score fourths, hazard ratios for all-cause mortality were 1.9 (95% confidence interval 1.4-2.5) for verbal, 2.2 (1.6-3.0) for visuospatial and 1.9 (1.4-2.5) for arithmetic reasoning, corresponding to 2.6, 3.4 and 2.6 excess years of life lost, respectively. Associations were similar for cardiovascular and non-cardiovascular mortality. Intellectual ability scores were stronger predictors in men who grew up in middle class families. Compared with middle class men in the highest fourth of visuospatial reasoning score, middle class men in the lowest fourth lost 6.5 years of life, while men from manual workers- families in the highest fourth lost 2.8 years and men in the lowest fourth lost 5.6 years.

Conclusions: High intellectual ability in men aged 20 protects from mortality in later life. This effect is stronger in men who grew up in middle class as compared with manual workers- families. We suggest that early life conditions that are unfavourable to development of cognitive abilities negate the life expectancy benefits of being born into a more affluent family.

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Citation

Kajantie, Eero, Raikkonen, Katri, Henriksson, Markus, Forsa, Tom, Heinonen, Kati, Pesonen, Anu-Katriina, Leskinen, Jukka T., Laaksonen, Ilmo, Paile-Hyvarinen, Maria, Osmond, Clive, Barker, David J.P. and Eriksson, Johan G. (2010) Childhood socio-economic status modifies the association between intellectual abilities at age 20 and mortality in later life Journal of Epidemiology & Community Health, 64, (11), pp. 963-969. (doi:10.1136/jech.2009.086967).

More information

Published date: November 2010
Keywords: intelligence, cognitive function, mortality, death, socio-economic status
Organisations: Dev Origins of Health & Disease

Identifiers

Local EPrints ID: 79891
URI: http://eprints.soton.ac.uk/id/eprint/79891
ISSN: 0143-005X
PURE UUID: 5ae02cd0-f794-4aff-9cbc-ecb0145190d6
ORCID for Clive Osmond: ORCID iD orcid.org/0000-0002-9054-4655

Catalogue record

Date deposited: 22 Mar 2010
Last modified: 18 Jul 2017 23:15

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Contributors

Author: Eero Kajantie
Author: Katri Raikkonen
Author: Markus Henriksson
Author: Tom Forsa
Author: Kati Heinonen
Author: Anu-Katriina Pesonen
Author: Jukka T. Leskinen
Author: Ilmo Laaksonen
Author: Maria Paile-Hyvarinen
Author: Clive Osmond ORCID iD
Author: David J.P. Barker
Author: Johan G. Eriksson

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