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Related Experiment Videos

Swedish early separated twins: identification and characterization.

N L Pedersen, L Friberg, B Floderus-Myrhed

    Acta Geneticae Medicae Et Gemellologiae
    |January 1, 1984
    PubMed
    Summary

    This study analyzed twins separated early in life from the Swedish Twin Registry. Findings reveal the timing and circumstances of separation for these unique twin pairs.

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    Area of Science:

    • Behavioral Genetics
    • Twin Studies
    • Human Development

    Background:

    • The Swedish Twin Registry provides a unique resource for studying twins.
    • Understanding the impact of early life separation on development requires detailed data on twin pairs.

    Purpose of the Study:

    • To identify and characterize twins separated early in life within the Swedish Twin Registry.
    • To gather detailed information on the circumstances and degree of separation for these twins.

    Main Methods:

    • Identification of 961 twin pairs separated by age 10 from the 1961 and 1973 cohorts.
    • A 1979 questionnaire was sent to 698 living pairs to collect data on separation reasons, timing, parental relatedness, and post-separation contact.
    • Categorization of 257 pairs based on strict separation criteria (unrelated rearing parents, no cohabitation post-separation, infrequent contact).

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    Main Results:

    • A significant proportion of twins (50%) were separated by their first birthday, and 80% by age five.
    • Detailed data were collected on separation circumstances, including parental biological relatedness and post-separation contact frequency.
    • A subset of 257 pairs met stringent criteria for early and significant separation.

    Conclusions:

    • The study successfully identified and characterized a substantial sample of early-separated twins.
    • The data provide a foundation for future research into the developmental outcomes of early life separation in twins.
    • Comparison with twins reared together will offer insights into environmental and genetic influences.