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  • Title: Genetic influence on parent-reported attention-related problems in a Norwegian general population twin sample.
    Author: Gjone H, Stevenson J, Sundet JM.
    Journal: J Am Acad Child Adolesc Psychiatry; 1996 May; 35(5):588-96; discussion 596-8. PubMed ID: 8935205.
    Abstract:
    OBJECTIVE: To assess the genetic and environmental influences on attention problems in a general population twin sample and to investigate whether there are changes in the relative genetic influence on attention problems with increasing severity. METHOD: Parental ratings of the Child Behavior Checklist were collected from five Norwegian national cohorts of same-sex twins. The sample comprises 526 identical and 389 fraternal pairs. RESULTS: Considerable genetic influence on attention problems was found for both sexes and across age groups (aged 5 to 9 years and 12 to 15 years). A two-parameter model with additive genetic influence and nonshared environment showed a good fit, with heritability ranging from .73 in boys aged 5 to 9 years, to .76 in girls aged 5 to 9 years. There was no change in the relative genetic influence across severity after accounting for the influence of cerebral palsy, epilepsy, and low birth weight. CONCLUSION: The results indicate a substantial genetic influence on attention problems across sex, age, and severity.
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