"We brought them all right into our laboratories and asked the same questions to both the child and the parents," Keyes says. "That way we were able to use our clinical training to diagnose symptoms ourselves."
Though there are other studies on ADHD and adoption, this one was unusual in that participants also had to have a non-adopted sibling within the same age range to help compare behaviors.
Adoption experts said that the study supports what they have known intuitively for a long time.
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