In general, mentally retarded children reach such developmental milestones as walking and talking much later than children in the general population. Symptoms of mental retardation may appear at birth or later in childhood
Mental Retardation: Typical Characteristics (Please note that these are generalizations. There is a great deal of individual variation)
Individuals with mild mental retardation (formerly referred...
Approximately 85% of the mentally retarded population is in the mildly retarded category. Their IQ score ranges from 50-70, and they can often acquire academic skills up to about the sixth-grade...
About 3-4% of the mentally retarded population is severely retarded. They have IQ scores of 20-40. They may master very basic self-care skills and some communication skills
About 10% of the mentally retarded population is considered moderately retarded. These people have IQ scores ranging from 35-55. They can carry out work and self-care tasks with moderate supervision
Only 1-2% of the mentally retarded population is classified as profoundly retarded. These individuals have IQ scores under 20-25. They may be able to develop basic self-care and communication skills...