Autism, also known as autism or autism disorder, is a representative disease of generalized developmental disorder (PDD). DSM-IV-TR classifies PDD into five types: loneliness disorder, Retts syndrome, childhood disintegration disorder, Asperger syndrome and unspecified PDD.

Among them, loneliness disorder and Asperger's syndrome are more common. There are different reports on the prevalence of autism, which is generally believed to be about 200-500/10,000 children, and the ratio of male to female is about 1:3- 1:4. The symptoms of girls are generally more serious than those of boys.

Extended data:

Autism patients show various forms of conservative or restrictive behaviors, among which the revised version of the Conservative Behavior Scale (RBS-R) is classified as follows.

1, strictly conservative actions, self-stimulation's behavior, unwilling to change, such as patting, shaking his head, or swinging his body.

2. Coercive behavior, such as arranging objects in a stacked or straight line, or forcing people to accommodate.

3. Similarity is a kind of resistance to behavior changes, such as sticking to furniture or refusing to be interrupted.

4. Ritual behavior involves a pattern of unwillingness to change habits, especially things you like, such as unwillingness to change your mouth or unwillingness to transfer to another school. This is closely related to similarity, and it is suggested to merge these two items.

5. Restrictive behavior includes the finiteness and narrowness of interest, attention or activity, and continuous focus on certain parts of the object, such as wheels. And the degree of attention to the objects/things of interest is abnormal compared with normal people.

6. Self-harm includes behaviors that hurt yourself or may hurt others, such as poking eyes, pinching skin, biting hands or hitting your head.

References:

Baidu encyclopedia autism