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Related Experiment Videos

Cigarette smoking and Down syndrome.

E B Hook, P K Cross

    American Journal of Human Genetics
    |November 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Cigarette smoking around conception showed a reduced risk for Down syndrome births in this study. This finding contrasts with earlier research and suggests potential selective effects on conception or early survival.

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    Area of Science:

    • Reproductive Epidemiology
    • Genetics
    • Perinatal Health

    Background:

    • Down syndrome is a significant genetic disorder.
    • Previous research suggested potential links between maternal factors and Down syndrome.
    • Understanding risk factors is crucial for prevention and intervention.

    Purpose of the Study:

    • To investigate the association between cigarette smoking around conception and the risk of Down syndrome.
    • To explore the influence of maternal age and alcohol consumption on this association.
    • To compare findings with previous studies on Down syndrome etiology.

    Main Methods:

    • A matched case-control study involving 100 mothers of Down syndrome children, 100 mothers of children with other defects, and 100 mothers of healthy children.

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  • Infants were born in upstate New York during 1980-1981.
  • Risk ratios were calculated for smoking around conception, with stratification for alcohol and maternal age.

    • Main Results:

    • A statistically significant negative association was observed between cigarette smoking around conception and Down syndrome.
    • Risk ratios were 0.58 (case-defect control) and 0.56 (case-normal control).
    • The negative association persisted after stratification and was more pronounced in mothers over 30.

    Conclusions:

    • The study suggests a potential protective effect of smoking against Down syndrome, contrary to some prior findings.
    • This observed negative association may be due to selective effects on gamete survival or early conceptus viability.
    • Further research is needed to elucidate the mechanisms behind this unexpected finding and rule out confounding factors.