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Scandinavian Journal of Public Health
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The Heritability of Smoking Behaviour in Pregnancy, and the Birth Weights of Offspring of Smoking-discordant Twins

P. Magnus

Institute of Medical Genetics, University of Oslo, Norway

K. Berg

Institute of Medical Genetics, University of Oslo, Norway

T. Bjerkedal

Medical Birth Registry, Norwegian Health Services

W. E. Nance

Department of Human Genetics, Medical College of Virginia, Richmond, Virginia, USA

Questionnaire information on smoking habits in pregnancy was collated in 341 monozygotic (MZ) and 321 dizygotic (DZ) female twin pair cases from a population-based Norwegian Twin Panel. In a multifactorial model, the intra-pair correlation in smoking was 0.797 (±0.042) in monozygotic (MZ) and 0.443 (±0.075) in dizygotic (DZ) twin pairs, indicating a substantial genetic influence on liability to smoke in pregnancy. The questionnaire information was linked with birth records in the Medical Birth Registry of Norway, and birth weights of offspring of 62 MZ and 100 DZ smoking-discordant twin pairs were studied. Offspring of smoking MZ twins weighed 127 g less than birth order matched offspring of the non-smoking co-twins. This finding is additional evidence that smoking is a direct cause of reduced birth weight in offspring.

Scandinavian Journal of Public Health, Vol. 13, No. 1, 29-34 (1985)
DOI: 10.1177/140349488501300104
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