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Associations between nonshared environment and child problem behaviour.

M C Wichers1, J van Os, M Danckaerts

  • 1Department of Psychiatry and Neuropsychology, Maastricht University, European Graduate School of Neuroscience, The Netherlands.

Social Psychiatry and Psychiatric Epidemiology
|October 19, 2001
PubMed
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Environmental factors significantly impact child psychopathology, but genetic mediation is unlikely. Extreme differences in sibling experiences correlate with symptoms, suggesting direct environmental links.

Area of Science:

  • Developmental Psychology
  • Behavioral Genetics
  • Child Psychiatry

Background:

  • Twin studies often attribute child psychopathology to nonshared environmental factors.
  • This study investigates potential overestimation of nonshared environment influence due to genetic mediation.
  • A direct measure of differential sibling experiences was used to assess child psychopathology.

Purpose of the Study:

  • To directly assess the relationship between the nonshared environment and child psychopathology.
  • To test for genetic mediation in the association between environmental experiences and behavioral differences.
  • To examine the influence of differential sibling experiences on internalizing, externalizing, and depressive symptoms.

Main Methods:

  • Utilized parent-rated Child Behaviour Checklist (CBCL) and Sibling Inventory of Differential Experience (SIDE) in 760 twin pairs (ages 6-17).

Related Experiment Videos

  • Employed multilevel regression analysis to link SIDE scores with CBCL symptom scores (total, internalizing, externalizing, depression).
  • Assessed genetic mediation by testing for interactions between zygosity and SIDE scores on CBCL differences.

    • Main Results:

    • Significant associations were found between Sibling Inventory of Differential Experience (SIDE) dimensions and child psychopathology symptoms.
    • These environmental effects were non-linear, most pronounced at the extremes of differential experiences within twin pairs.
    • No strong evidence emerged for genetic mediation in the link between nonshared environment and psychopathology symptoms.

    Conclusions:

    • Direct, potentially skewed relationships exist between nonshared environmental factors and behavioral differences in children.
    • The findings suggest environmental influences on child psychopathology may not be significantly mediated by genetic factors.
    • Longitudinal research is needed to establish the causal directionality between environment and behavior.