The tendency to conceive spontaneous dizygotic (DZ) twins is a complex trait with important
contributions from both environmental factors and genetic disposition. Twins are relatively …

OBJECTIVE: To review findings on attention-deficit/hyperactivity disorder and attention
problems (AP) in children, adolescents, and adults, as established in the database of the …

The Netherlands Twin Register (NTR) is a national register in which twins, multiples and
their parents, siblings, spouses and other family members participate. Here we describe the …

Recent findings of an association between anesthesia administration in the first three years
of life and later learning disabilities have created concerns that anesthesia has neurotoxic …

Background. The influence of genetic factors on major depressive disorder is lower than on
other psychiatric disorders. Heritability estimates mainly derive from cross-sectional studies …

Promotion of mental well-being and prevention of emotional and behavioral problems are
suggested to go hand in hand. The present study examined the association between …

Subjective Wellbeing (SWB) can be assessed with distinct measures that have been
hypothesized to represent different domains of SWB. The current study assessed SWB with …

The Netherlands Twin Register (NTR) began in 1987 with data collection in twins and their
families, including families with newborn twins and triplets. Twenty-five years later, the NTR …

OBJECTIVE: To investigate whether items assessing attention problems provide evidence of
quantitative differences or categorically distinct subtypes of attention problems (APs) and to …

In 2004 the Netherlands Twin Register (NTR) started a large scale biological sample
collection in twin families to create a resource for genetic studies on health, lifestyle and …