Helene Gjone

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This study analyzed the genetic and environmental influences on internalizing and externalizing behavior problems and the nature of their cooccurrence in the national Norwegian twin sample. The sample comprised 526 identical and 389 fraternal same-sexed twin pairs from five to birth cohorts, aged 5-6, 8-9, 12-13, 13-14, and 14-15 years. Behavior problems(More)
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(More)
Generalization from twin studies relies on the assumption that liability to develop the disorder which is studied is influenced by similar factors in twins and singletons. The present study examines the impact of pre- and perinatal factors on parental reports of behaviour problems in 1832 twins, and compares level of attention problems, internalizing and(More)
OBJECTIVES To assess the longitudinal covariance between emotionality, activity, and sociability (EAS) temperamental traits and anxious/depressed behavior, attention problems, delinquent behavior, and aggressive behavior and to assess the significance of genetic and common environmental influences on the temperament and behavior relations. METHOD Parental(More)
The present study addresses the issue of differential heritability with increasing severity of parent-reported internalizing and externalizing behavior problems assessed by the Child Behavior Checklist. The sample includes 526 identical and 389 fraternal same-sexed twin pairs from five national birth cohorts, aged 5-6, 8-9, and 12-15 years. Heritability(More)
Familial adenomatous polyposis (FAP) in a parent requires diagnostic follow-up and treatment from adolescence in possible gene carriers in order to prevent cancer development. A nationwide sample (n = 22) of adolescent FAP offspring including 85% of eligible individuals aged 11-20 years and their parents were interviewed with regard to adolescent mental(More)
AIM The present study investigates associations between autonomic cardiovascular dysregulation, psychosocial load and mental health in adolescents presenting with chronic fatigue. METHOD Twenty-two adolescents, mean age 15.7 years (12.7-19.1), underwent a clinical mental health examination as part of a broad medical investigation which included autonomic(More)
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