Approximately 90 percent of people who are mentally retarded are

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Mild mental retardation is the most common type of mental retardation, accounting for about 85 percent of cases. This level of mental retardation is characterized by an IQ score of 50-70 and limitations in adaptive functioning in areas such as communication, self-care, and social skills. Profound mental retardation (IQ below 20-25) is the least common, accounting for less than 5 percent of cases. Moderately (IQ 35-50) and severely (IQ 20-35) mentally retarded individuals make up the remaining 10 percent of cases.

Approximately 90 Percent of People Who Are Mentally Retarded Are