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Tobacco smoking and twinning
J Olsen1, B Bønnelykke, J Nielsen
1Institute of Social Medicine, University of Aarhus, Denmark.
Acta Medica Scandinavica
|January 1, 1988
Abstract:
In a case-control study an association was found between mothers' smoking habits and the frequency of dizygotic twinning. As cases were included all twins born in Denmark in 1984 and 1985. A random sample of 1.5% of mothers to singletons, born in the same period were selected as controls. Only live-borns, conceived after no hormonal treatment, were included in the study. The finding may be due to the well-known anti-estrogen effect of smoking.
Keywords:
BehaviorBiologyControl GroupsDenmarkDeveloped CountriesEndocrine SystemEstrogens--changesEuropeFamily And HouseholdFamily CharacteristicsFamily RelationshipsFollicle Stimulating Hormone--changesGeneticsGenetics, PopulationGonadotropinsGonadotropins, PituitaryHormonesLuteinizing Hormone--changesMothersNorthern EuropeParentsPhysiologyPopulation StatisticsPregnancyPregnancy, MultipleQuestionnairesReproductionResearch MethodologyScandinaviaSmokingSurvey MethodologySurveys