Rising rates of attention-deficit hyperactivity disorder, or ADHD, have led scientists to question who is getting diagnosed and why, and a new study of Taiwanese children suggests that when a child is younger in their grade, they are more likely to be diagnosed with ADHD...Dr. Max Wiznitzer, a pediatric neurologist at University Hospitals Rainbow Babies and Children's Hospital, said the study shows that it is vital that doctors look at multiple factors when making an ADHD diagnosis and that they take a student's age into account.