First-degree mental disability (extremely severe): IQ is below 20, and the level of adaptive behavior is extremely lacking;
Secondary mental disability (severe): IQ value is 20 ~ 34, and the level of adaptive behavior is seriously insufficient;
Third-grade mental disability (moderate): IQ value is 35 ~ 49, and the level of adaptive behavior is moderately lacking;
Level 4 mental disability (mild): IQ value is 50 ~ 69, and the level of adaptive behavior is slightly defective.
Practical evaluation criteria for disabled people in China
Article 1 Definition of intellectual disability Intellectual disability refers to the fact that people's intelligence is obviously lower than the average person's level, showing adaptive behavioral disorders.
Intellectual disability includes: mental retardation caused by various reasons in the process of intellectual development; After the maturity of intelligence, dementia caused by various reasons and intelligence decreased obviously in old age.
Article 2 Classification of intellectual disability
According to the classification standards of the World Health Organization (WHO) and the American Association for Mental Retardation (AAMD), mental disabilities are classified according to intelligence quotient (IQ) and social adaptive behavior. The list is as follows:
Intelligence level level IQ (intelligence quotient) range adapts to behavior level.
Serious first-class and second-class 20-34 serious defects
Moderate level III 35-49 Moderate defect
Mild Grade 4 50-69 Mild defect