Smoking during pregnancy and hyperactivity-inattention in the offspring: comparing results from three Nordic cohorts

Obel, C. and Linnet, K. M. and Henriksen, T. B. and Rodriguez, A. and Jarvelin, M. R. and Kotimaa, A. and Moilanen, I. and Ebeling, H. and Bilenberg, N. and Taanila, A. and Ye, G. and Olsen, J. (2009) Smoking during pregnancy and hyperactivity-inattention in the offspring: comparing results from three Nordic cohorts. International Journal of Epidemiology, 38 (3). pp. 698-705. ISSN 0300-5771

Full content URL: http://dx.doi.org/10.1093/ije/dym290

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Item Type:Article
Item Status:Live Archive

Abstract

Background Prenatal exposure to smoking has been associated with Attention Deficit Hyperactivity Disorder (ADHD) in a number of epidemiological studies. However, mothers with the ADHD phenotype may ‘treat’ their problem by smoking and therefore be more likely to smoke even in a society where smoking is not acceptable. This will cause genetic confounding if ADHD has a heritable component, especially in populations with low prevalence rates of smoking since this reason for smoking is expected to be proportionally more frequent in a population with few ‘normal’ smokers. We compared the association in cohorts with different smoking frequencies.

Methods A total of 20 936 women with singleton pregnancies were identified within three population-based pregnancy cohorts in Northern Finland (1985–1986) and in Denmark (1984–1987 and 1989–1991). We collected self-reported data on their pre-pregnancy and pregnancy smoking habits and followed the children to school age where teachers and parents rated hyperactivity and inattention symptoms.

Results Children, whose mothers smoked during pregnancy, had an increased prevalence of a high hyperactivity-inattention score compared with children of nonsmokers in each of the cohorts after adjustment for confounders but we found no statistical significant difference between the associations across the cohorts.

Conclusion The estimated association was not strongest in the population with the fewest smokers which does not support the hypothesis that the association is entirely due to genetic confounding.

Keywords:Smoking, Confounding, Prenatal, Child behaviour, ADHD
Subjects:L Social studies > L510 Health & Welfare
C Biological Sciences > C841 Health Psychology
Divisions:College of Social Science > School of Psychology
ID Code:22940
Deposited On:26 Jul 2016 08:14

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