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Alternative explanations for normal variability in antithrombin-III levels.

E A Thompson, D T Bishop

    Annals of Human Biology
    |July 1, 1985
    PubMed
    Summary
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    Familial blood clotting times show significant age and parental influences in healthy individuals. Some sibling similarity persists after accounting for parental effects, suggesting complex genetic and environmental factors.

    Area of Science:

    • Hematology
    • Human Genetics
    • Biostatistics

    Background:

    • Blood clotting time variability exists even in individuals without Antithrombin III deficiency.
    • Understanding familial influences on normal hemostasis is crucial for interpreting coagulation disorders.

    Purpose of the Study:

    • To investigate the familial variability of blood clotting times in genotypically normal individuals.
    • To identify age, parental, and sibling effects on blood coagulation parameters.

    Main Methods:

    • Statistical modeling was applied to analyze blood clotting time data from families.
    • Models assessed age effects, parental influences (genetic/environmental), and within-sibship similarity.

    Main Results:

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  • A significant age effect on blood clotting times was observed.
  • Strong evidence for parental influence on clotting times was found.
  • Within-sibship similarity was noted, but became non-significant after accounting for parental effects.

    • Conclusions:

    • Blood clotting times in healthy individuals are influenced by age and parental factors.
    • While some residual sibling similarity exists, it is not strongly significant after accounting for parental effects, indicating complex inheritance patterns.