Question
What is the likelihood of a twin brother having ADHD if the other twin has been diagnosed with the condition?
Answers
GPT-4o mini
The likelihood of a twin brother having ADHD if the other twin has been diagnosed varies depending on whether they are identical (monozygotic) or fraternal (dizygotic) twins.
Research suggests that ADHD has a significant genetic component. In identical twins, if one twin has ADHD, the other twin has about a 60-90% chance of also having the condition. This high concordance rate indicates a strong genetic influence.
In fraternal twins, the concordance rate is lower, around 20-30%. This lower rate reflects the shared genetic environment but also points to additional environmental factors that can influence the development of ADHD.
Overall, if one twin has been diagnosed with ADHD, the other twin's chances of also being diagnosed are significantly elevated, with identical twins showing a much higher likelihood than fraternal twins.
Research suggests that ADHD has a significant genetic component. In identical twins, if one twin has ADHD, the other twin has about a 60-90% chance of also having the condition. This high concordance rate indicates a strong genetic influence.
In fraternal twins, the concordance rate is lower, around 20-30%. This lower rate reflects the shared genetic environment but also points to additional environmental factors that can influence the development of ADHD.
Overall, if one twin has been diagnosed with ADHD, the other twin's chances of also being diagnosed are significantly elevated, with identical twins showing a much higher likelihood than fraternal twins.