Genetic and environmental influences on the covariation between hyperactivity and conduct disturbance in juvenile twins

Article Abstract:

Covariation between hyperactivity and conduct disturbances in juvenile twins is due to genetic factors. In younger males and females, same set of genes are responsible for the variations in hyperactivity and conduct disturbances. However, in the older twins some of the genetic effects are behavior and gender specific. This indicates that the two behaviors fail to represent the same latent psychiatric condition.

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The impact of child IQ parent IQ and sibling IQ on child behavioural deviance scores

Article Abstract:

A study of an epidemiological sample of 411 13-year-old twins of normal intelligence revealed behavioral disorders to be independent of variations of IQ levels among siblings and deficient IQ levels to be correlated with more psychopathology in the subjects. Problem behavior in children is attributed more to biological factors and less with psychosocial factors such as parents' IQ.

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The Croyden Assessment of Learning study: Prevalence and educational identification of mild mental retardation

Article Abstract:

The prevalence of low IQ in the mental retardation range in a population sample is estimated and the factors that relate to educational identification are examined. The results indicated a high estimate of the prevalence of mild intellectual disability and highlighted the fact that the majority of mild intellectual disability in the UK would not be detected using registers.

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