BackgroundNo prior twin study has explored the heritability of clinically diagnosed attention
deficit hyperactivity disorder (ADHD). Such studies are needed to resolve conflicting results …

Attention‐deficit/hyperactivity disorder (ADHD) is a common neurodevelopmental disorder.
Symptoms often persist into adulthood, with a prevalence of 2.5–5% in adult populations …

OBJECTIVE: The majority of published reports on twin studies of attention deficit
hyperactivity disorder (ADHD) have indicated robust additive genetic influences and unique …

BackgroundAttention deficit hyperactivity disorder (ADHD) frequently persists into adulthood.
Family and twin studies delineate a disorder with strong genetic influences among children …

Background. Follow-up studies of childhood ADHD have shown persistence of the disorder
into adulthood, but no epidemiological data are yet available. Method. ADHD DSM-IV …

Context In contrast to the large number of studies in children, there is little information on the
contribution of genetic factors to Attention Deficit Hyperactivity Disorder (ADHD) in adults …

Twin studies described a strongly heritable component of attention-deficit/hyperactivity
disorder (ADHD) in children and adolescents. However, findings varied considerably …

Objective To review research findings that consider whether attention deficit hyperactivity
disorder (ADHD) is a discrete entity or whether it is more consistent with an extreme end-of …

OBJECTIVE: To investigate heritability and continuum versus categorical approaches to
attention-deficit hyperactivity disorder (ADHD), using a large-scale twin sample. METHOD: A …

Importance Attention-deficit/hyperactivity disorder (ADHD) is now recognized to occur in
adulthood and is associated with a range of negative outcomes. However, less is known …