Two new interesting U.S. studies point to one of the ways that children are diagnosed with attention deficit hyperactivity disorder – age as compared to peers. It appears that children who are younger than their classmates tend to get the diagnosis more often than do their older peers.
The first study, by researchers at North Carolina State University, the University of Notre Dame and the University of Minnesota, compared children who were born just before the kindergarten eligibility date and those born just after the eligibility date. They found a 25% higher rate of ADHD diagnosis in those who were younger in the class. They used three separate data sources and looked at tens of thousands of children aged seven to 17.
When a doctor evaluates whether a child may have ADHD, one of the frequent questions that is asked is if the behavior seems to be exhibited in their child more often than in others.
The other study looked at 12,000 children by a Michigan State University economist Todd Elder. It found that the youngest child in the class is 60% more likely to be diagnosed with ADHD than is the oldest child in the class.