- How many children do you think currently meet criteria for a mental health disorder(s) in the United States? (Answer this question as a percentage, out of 100). Out of the disorders that you can think of right now (again, please don't google search or go to the textbook), which psychological disorder do you think is most common in children? Finally, what factors do you think are important in distinguishing between normal and abnormal behavior in children? (Please be specific and name at least 2 factors).