Mental retardation

Mental retardation refers to the fact that before the maturity of an individual (usually before the age of 18), the mental function caused by mental retardation, mental retardation or obstruction is significantly lower than the same age level, and accompanied by social adaptation difficulties It is a syndrome mainly characterized by. The intelligence quotient (IQ) is 2.0 standard deviations below the average of the population (the average IQ of the population is set to 100, and the IQ of one standard deviation is 15). Generally, the IQ below 70 (or 75) means that the intelligence is significantly lower than the average level. Adaptive behavior includes two aspects: personal living ability and performance of social responsibilities. The clinical manifestations are cognition, language, emotional will, and socialization. They lag significantly behind children of the same age in terms of maturity and function, and may be accompanied by some mental or physical disease, or secondary to the latter.

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