(1) Classification by intelligence level: The World Health Organization classifies mental retardation into five grades according to intelligence measurement results. That is, ① suspicious; ② Mild; ③ Moderate; ④ Severe; ⑤ Very serious. A survey in the United States shows that the proportion of mental retardation at all levels is 67%, 20%, 6.0%, 3.0% and 2.0% respectively.
(2) Kirk, an American educational psychologist, divides mentally retarded children into:
(1) educatable. The IQ is between 50 and 69. This kind of children have poor abstract thinking ability, insensitive reaction, hard study and poor grades. But life can take care of itself and engage in simple labor. ② Trainer. IQ is 25~49. This kind of child only has action thinking. They are insensitive and clumsy. With a good education, you can learn simple sentences, which often can't convey your meaning. But they know how to avoid danger. Protected, you can live to middle age. (3) Need maintenance. An IQ below 24 is the so-called idiot. Can't talk, can't count, can't live independently, and can live to adulthood with careful maintenance.
(3) China's classification: China usually divides mental retardation into three types: idiot, idiot and dull.
① Idiot: The mental retardation is the most serious, and the intelligence level is lower than the normal 3-year-old children. Idiot children can't count, can't talk, can't avoid danger, can't live independently, and most of them die in infancy. Idiot: The mental retardation is serious, and the intelligence level is equivalent to that of children aged 4-7. Stupid children can learn to speak, but they often can't express themselves clearly. After training, you can take care of your daily life. Can live to adulthood under the protection of adults. 3 stupid: also known as stupid, low intelligence is light. Such children can go to school to study, but their academic performance is poor and they can't keep up with work. But you can study in a special school. After education and training, I can do some simple non-technical work.
From the encyclopedia of mental retardation
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