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... substantially, by some estimates doubling in the 1990's. The disorder occurs as much as four to nine times more in boys than in girls (Santrock, 2003). Some experts attribute the increase mainly to heightened awareness of the disorder. Others are concerned that many children are being diagnosed without undergoing extensive professional evaluation based on input from multiple sources. Signs of ADHD may be present in the preschool years. Parents and preschool or kindergarten teachers may notice that the child has an extremely high activity level and a limited attention span. They may say the child is "always on the go" or "never seems to listen". Many children with ADHD are difficult to discipline, have low frustration tolerance, and have problems in peer relations. Other common characteristics of children with ADHD include general immaturity and clumsiness. Although signs of ADHD are often present in the preschool years, their classification often doesn't take ...