How common is mental retardation?

It is estimated that around one percent of people in America suffer from a degree of mental retardation; of this proportion of people, 85 percent of cases are said to be moderate or mild, meaning that it is possible to help these people to learn and develop.

This guide to mental retardation sets out to answer the common questions concerning mental retardation. The areas covered include the following:

• What causes mental retardation?
• Diagnosing mental retardation
• What are the symptoms of developmental delay?
• Treating mental retardation