Low IQ

Mental retardation (MR) is a group of diseases in which the general mental function is significantly lower than the same age level during the developmental period, and the same amount is accompanied by adaptive behavioral defects. 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 a standard deviation is 15). Generally, the IQ below 70 (or 75) means that the intelligence is significantly lower than average. Adaptive behavior includes two aspects: personal living ability and performance of social responsibilities. Developmental period generally refers to under 18 years of age. There are various names for mental retardation. Psychiatry is called "mental retardation", "mental insufficiency", and "mental defects". Education and psychology are called "mental retardation" and "mental impairment". Pediatrics are called "mentally retarded", "smart retardation", and "mental retardation". Special education schools are called "mentally handicapped" and "mentally disabled".

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