New studies supporting suspicions related to attention-deficit disorder or attention-deficit/hyperactivity disorder are witnessed to grow.

Two new U. S. studies have claimed that children studying amidst of classmates who are elder to them are more likely to be treated for or diagnosed with attention-deficit/hyperactivity disorder.

ADHD is a type of mental health disorder, characterized by rare behaviors like inattention, hyperactivity and lack of concentration.

A new study conducted by North Carolina State University has shed light on significant variations in diagnoses among children with similar birth dates, but different kindergarten eligibility dates. The study is reported to be published in the Journal of Health Economics, and is summed up in the university's news release.

Co-author Melinda Morrill, a research Assistant Professor of economics at North Carolina State, posted that no biological or medical reasons supporting the variation in the ADHD diagnosis rates have been brought to light.

“It appears that the youngest in the class who are likely less mature, or are exhibiting immature behavior, that these children are being mistakenly diagnosed as having ADHD”, she quoted at a conference in Jackson Hole, Wyo.

Besides, a new associated research from Michigan State University has outlined that over 1 million kids may have not been properly diagnosed because of age.