That so many hyperactive children have remained hidden in the general population may be because people have treated them as "mischievous," and, as many people think "mischieviousness is a sign of intelligence," the child's behavior is not considered to be a serious problem.
那麼多過動兒隱藏在一般兒童中沒被發現，是因為過去許多人把過動兒誤以為頑皮，而「小孩頑皮代表聰明」，不必當一回事。