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Acta Psychiatr Scand. 2008 Aug;118(2):99-105. doi: 10.1111/j.1600-0447.2008.01171.x. Epub 2008 Mar 10.

Association of IQ scores and school achievement with suicide in a 40-year follow-up of a Swedish cohort.

Author information

1
Department of Public Health and Community Medicine, Social Medicine, Sahlgrenska Academy at Göteborg University, Göteborg, Sweden. lena.andersson@socmed.gu.se

Abstract

OBJECTIVE:

Few studies have investigated the association of childhood IQ and school achievement with suicide. The aim of this study was to investigate the association of childhood IQ with suicide in a cohort of Swedish women and men.

METHOD:

21 809 subjects born in 1948 and 1953 who completed IQ and school tests at age 13 years have been followed until 2003. Information on paternal education and in-patient care for psychosis was linked using the Swedish personal identification number.

RESULTS:

There were 180 suicides amongst subjects with measured IQ. High IQ was associated with reduced suicide risk among men (OR per unit increase in age-adjusted model 0.90, 95% CI 0.83-0.99), while there was no statistical evidence of an association in women (OR 1.04, 95% CI 0.90-1.20). Among men with a history of psychosis, high IQ was associated with an increased risk of suicide.

CONCLUSION:

Low childhood IQ at age 13 years is associated with an increased risk of suicide in men but not in women; however, amongst those with psychosis, low IQ appears to be protective.

[Indexed for MEDLINE]

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