title: Genetic and environmental influences on early childhood behavior.
abstract: The Child Behavior Checklist for Ages 2-3 (Adelbach et al., J. Abnorm. Child Psychol. 15;629-650; 1987) was completed by mothers of 229 pairs of twins (mean age = 33 months). Using the two broad-band groupings of Internalizing and Externalizing described by Achenbach et al. (1987), various models to estimate genetic and environmental parameters were fitted using LISREL 7. Model-fitting results showed that the genetic components to the observed phenotypical variation were small and not necessary in the model. Influences from the shared environment, however, could not be dropped from the model without a deterioration in fit. Parameter estimates were not significantly different in boys and girls.
authors.affiliation: Institute for Behavioral Genetics, University of Colorado, Boulder 80309-0447.
authors.forename: S
authors.initials: S
authors.lastname: Schmitz
authors.forename: S S
authors.initials: SS
authors.lastname: Cherny
authors.forename: D W
authors.initials: DW
authors.lastname: Fulker
authors.forename: D A
authors.initials: DA
authors.lastname: Mrazek
mesh_terms: D002652:Child Behavior; D002653:Child Behavior Disorders / Q000235:genetics / Q000523:psychology; D002675:Child, Preschool; D004200:Diseases in Twins / Q000235:genetics / Q000523:psychology; D005260:Female; D006801:Humans; D007389:Internal-External Control; D008297:Male; D008957:Models, Genetic; D010552:Personality Assessment; D010553:Personality Development; D012931:Social Environment; D014429:Twins, Dizygotic / Q000235:genetics* / Q000523:psychology; D014430:Twins, Monozygotic / Q000235:genetics* / Q000523:psychology