Zobrazeno 1 - 3
of 3
pro vyhledávání: '"J C, van Der Valk"'
Publikováno v:
Behavior Genetics. 33:409-420
In a sample of 1,940 Dutch 7-year-old twin pairs we studied the etiology of individual differences in Internalizing and Externalizing behavioral problems. For the majority of twins in the sample, both maternal and paternal ratings of behavioral probl
Publikováno v:
Twin Research (2000). 3:134-141
This study reports on zygosity determination in twins of childhood age. Parents responded to questionnaire items dealing with twin similarity in physical characteristics and frequency of mistaking one twin for another by parents, relatives and strang
Publikováno v:
Behavior genetics. 28(5)
The genetic and environmental influences on problem behaviors at two assessment points, three years apart, and their stability were studied in a sample of international adoptees, initially aged 10 to 15 years. Parents of 111 pairs of adopted biologic