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Twin sibling differences in parental reports of ADHD, speech, reading and behaviour problems
1University of New South Wales, Australia.
Summary
Twins exhibit more Attention Deficit Hyperactivity Disorder (ADHD) symptoms than siblings, with significant differences also noted in speech and reading abilities. These behavioral and developmental variations warrant further investigation in twin and sibling studies.
Area of Science:
- Developmental Psychology
- Behavioral Genetics
- Child Psychiatry
Background:
- Understanding behavioral differences between twins and siblings is crucial for disentangling genetic and environmental influences.
- Previous research has explored various developmental outcomes in twin and sibling pairs, but specific comparisons for behavioral problems require further elucidation.
Purpose of the Study:
- To investigate and compare the prevalence of behavioral problems, specifically Attention Deficit Hyperactivity Disorder (ADHD), Oppositional Defiant Disorder (ODD), Conduct Disorder (CD), and Separation Anxiety (SA), between twins and siblings.
- To examine the association of gestational age, birth weight, and speech/reading problems with these behavioral differences.
Main Methods:
- A non-selected sample of 1938 families with children aged 4-12 years participated.
- Questionnaires based on DSM-III-R criteria for ADHD, ODD, CD, and SA were administered and validated by clinical interviews.
- Measures for speech and reading problems were also included.
Main Results:
- Significant differences were found in Attention Deficit Hyperactivity Disorder (ADHD) symptoms between twins and siblings.
- No significant differences were observed for Oppositional Defiant Disorder (ODD), Conduct Disorder (CD), or Separation Anxiety (SA) symptoms.
- Twins and siblings differed significantly in gestational age, birth weight, and the presence of speech and reading problems.
- While birth weight and gestational age showed minimal contribution to ADHD symptom differences, a strong association was found between ADHD symptoms and speech/reading problems.
Conclusions:
- Twins, compared to siblings, present with a higher incidence of Attention Deficit Hyperactivity Disorder (ADHD) symptoms.
- The findings highlight a significant link between ADHD symptoms and challenges in speech and reading development, independent of birth weight and gestational age.
- Further research is recommended to explore the underlying mechanisms contributing to these observed differences in twins and siblings.
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