Article
Genetic and environmental contributions to stability and change of ADHD symptoms between 8 and 13 years of age: a longitudinal twin study.
Journal of the American Academy of Child and Adolescent Psychiatry - 1 Oct 2004
Larsson Jan-Olov, Larsson Henrik, Lichtenstein Paul
Abstract excerpt
OBJECTIVE: To study the genetic and environmental contributions to stability and change of attention-deficit/hyperactivity disorder (ADHD) symptoms between 8 and 9 and 13 and 14 years of age. METHOD: The sample included 1,480 twin pairs born in Sweden between May 1985 and December 1986. At wave 1 in 1994, when twins were 8-9 years old, 1,106 (75%) of the parents responded to a mailed questionnaire, and at wave 2...
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