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Debbie A. Lawlor, PhD, Heather Clark, MSc and David A. Leon, PhD

Debbie A. Lawlor is with the Department of Social Medicine, University of Bristol, Bristol, England. Heather Clark is with the Dugald Baird Centre, University of Aberdeen, Aberdeen, Scotland. David A. Leon is with the Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, England.

Correspondence: Requests for reprints should be sent to Debbie A. Lawlor, PhD, Department of Social Medicine, University of Bristol, Canynge Hall, Whiteladies Road, Bristol BS8 2PR, England (e-mail: d.a.lawlor{at}bristol.ac.uk).

Objectives. We examined associations between childhood intelligence and hospital admissions for injuries in adulthood.

Methods. Data were derived from a cohort study (=11103) involving individuals born in Aberdeen, Scotland, between 1950 and 1956.

Results. Overall, 1043 cohort members had at least 1 hospital admission resulting from an unintentional injury over 231152 person-years of risk. There were inverse linear associations between childhood intelligence assessed at the ages of 7, 9, and 11 years and having had a hospital admission stemming from an unintentional injury (gender-adjusted hazard ratio [HR] for a 1-standard-deviation increase in intelligence test score at age 7 years = 0.75; 95% confidence interval [CI]=0.70, 0.80). These associations were not markedly affected by adjustment for childhood socioeconomic status, maternal age or height, birthweight, or childhood growth. However, they were attenuated after adjustment for educational attainment (HR=0.85; 95% CI=0.78, 0.91).

Conclusions. Childhood intelligence is related to hospital admissions for injuries in adulthood, and this relationship is partly explained by educational attainment. The association between childhood intelligence and injury may contribute to the association between childhood intelligence and premature mortality demonstrated in several studies.

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