A fact sheet on children's mental health statistics from 2008:

• During the course of a year, 1 in 5 children have a diagnosable mental disorder.
• While most of these disorders can be treated, less than 25% of these children get the help they need.
• One in 10 children and adolescents suffer from a mental illness severe enough to result in significant functional impairment.
• More than 7.5 million children under the age of 18 in the U.S. have a mental illness severe enough to result in significant functional impairment – this is the equivalent of almost 4 times the number of prisoners in all Federal and State Prisons, and local jails combined!