Most experts estimate that ADHD is affecting between 2 and 5 percent of children in kindergarten through grade 12, however some studies have indicated that those estimations are low. In Rochester, about still another of the children with ADHD also have tic disorders, even though tics in some children are very mild, Dr. Kurlan tells. Studies have tied up both ADHD and tics to problems in the brain's basal ganglia together with in connections between the basal ganglia and the frontal lobes, that can explain why the 2 main disorders often appear together, he comes with. My websites: http:///item.php?id=4142 clondine