IQ in early adulthood and later cancer risk: cohort study of one million Swedish men

G Batty, K Modig Wennerstad, G Davey Smith, D Gunnell, I Deary, P Tynelius, F Rasmussen

Research output: Contribution to journalArticle (Academic Journal)

46 Citations (Scopus)

Abstract

BACKGROUND: While several studies have reported an inverse relation between IQ and total mortality rates, little is known about the association, if any, between IQ and disease-specific outcomes, particularly cancer. METHODS: A cohort of 959 540 Swedish men who underwent IQ testing at military conscription at around 19 years of age, and who were followed for incident cancer. Hazards ratios for the relation between IQ and 20 cancer outcomes were computed using Cox regression. RESULTS: During an average of 19.5 years of follow-up, there were 10 273 new cancer cases. IQ showed few associations with the cancer end points studied. There was a suggestion that IQ was positively associated with lung cancer, and inversely related to stomach, oesophageal and liver malignancies, although effects were modest. The only robust gradient was found for IQ in relation to skin cancer (HR(per one standard deviation advantage in IQ); 95% confidence interval 1.18; 1.13, 1.24; P value for trend across categories:
Translated title of the contributionIQ in early adulthood and later cancer risk: cohort study of one million Swedish men
Original languageEnglish
Pages (from-to)21 - 28
Number of pages8
JournalAnnals of Oncology
Volume18 (1)
DOIs
Publication statusPublished - Jan 2007

Bibliographical note

Publisher: Oxford University Press

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