An estimated 10 to 20 percent of children worldwide have one or more mental or behavioral problems. Many disorders commonly found among adults, such as depression, can begin during childhood, the World Health Organization reports. Categories specific to childhood and adolescence include disorders of psychological development, including dyslexia and autism, as well as behavioral and emotional disorders, such as attention deficit/hyper activity and conduct disorders.

Continue to read here (UN Chronicle, No. 2, 2002)