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Evidence for Genetic Influence on ADHD from Twin and Adoption Studies
The significant role of genetics in ADHD is supported by twin and adoption studies. A comprehensive 2009 review by Burt revealed that the median concordance rate for identical twins was .66, substantially higher than the .20 rate for fraternal twins. The same review identified a concordance rate of .09 for unrelated adoptive siblings, suggesting that while genetics are primary, environmental factors may also contribute to the disorder's development.
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Ch.15 Psychological Disorders - Psychology @ OpenStax
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