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Childhood IQ and survival to 79: Follow-up of 94% of the Scottish Mental Survey 1947.

Čukić, I, Brett, CE, Calvin, CM, Batty, GD and Deary, IJ (2017) Childhood IQ and survival to 79: Follow-up of 94% of the Scottish Mental Survey 1947. Intelligence, 63. pp. 45-50. ISSN 0160-2896

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Open Access URL: https://doi.org/10.1016/j.intell.2017.05.002 (Published version)


To extend previous literature that suggests higher IQ in youth is associated with living longer. Previous studies have been unable to assess reliably whether the effect differs across sexes and ages of death, and whether the effect is graded across different levels of IQ.
We test IQ-survival associations in 94% of the near-entire population born in Scotland in 1936 who took an IQ test at age 11 (n = 70,805) and were traced in a 68-year follow-up.
Higher IQ at age 11 years was associated with a lower risk of death (HR = 0.80, 95% CI = 0.79, 0.81). The decline in risk across categories of IQ scores was graded across the full range with the effect slightly stronger in women (HR = 0.79, 95% CI = 0.77, 0.80) than in men (HR = 0.82, 95% CI = 0.81, 0.84). Higher IQ had a significantly stronger association with death before and including age 65 (HR = 0.76, 95% CI = 0.74, 0.77) than in those participants who died at an older age (HR = 0.79, 95% CI = 0.78, 0.80).
Higher childhood IQ is associated with lower risk of all-cause mortality in both men and women. This is the only near-entire population study to date that examines the association between childhood IQ and mortality across most of the human life course.

Item Type: Article
Uncontrolled Keywords: 1701 Psychology, 1702 Cognitive Science
Subjects: B Philosophy. Psychology. Religion > BF Psychology
H Social Sciences > H Social Sciences (General)
H Social Sciences > HA Statistics
Divisions: Natural Sciences & Psychology (closed 31 Aug 19)
Publisher: Elsevier
Date Deposited: 06 Jun 2017 10:57
Last Modified: 04 Sep 2021 11:27
DOI or ID number: 10.1016/j.intell.2017.05.002
URI: https://researchonline.ljmu.ac.uk/id/eprint/6643
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