Жалпы даму бұзылысы, басқаша белгіленбеген (ПДД-ББ) туралы мәліметтер

Pervasive developmental disorder not otherwise specified (PDD NOS) is a historic psychiatric diagnosis first defined in 1980 that has since been incorporated into autism spectrum disorder in the DSM 5 (2013). According to the earlier DSM IV, PDD NOS referred to "mild or severe pervasive deficits in the development of reciprocal social interaction and/or verbal and nonverbal communication skills, or when stereotyped behavior, interests, and/or activities are present, but the criteria are not met for a specific PDD" or for several other disorders. PDD NOS was one of four disorders collapsed into the diagnosis of autism spectrum disorder in the DSM 5, and also was one of the five disorders classified as a pervasive developmental disorder (PDD) in the DSM IV. The ICD 10 equivalents also became part of its definition of autism spectrum disorder, as of the ICD 11. PDD NOS included atypical autism, a diagnosis defined in the ICD 10 for the case that the criteria for autistic disorder were not met because of late age of onset, or atypical symptomatology, or both of these. Even though PDD NOS was considered milder than typical autism, this was not always true. While some characteristics may be milder, others may be more severe.

PDD NOS is not a current part of the Diagnostic and Statistical Manual of Mental Disorders typology (as of the DSM 5), which is the most common diagnostic typology used in the United States. In the still used (though deprecated) ICD 10, it is considered "atypical autism" and "pervasive developmental disorder, unspecified". The diagnosis of a pervasive developmental disorder not otherwise specified was given to individuals with difficulties in the areas of social interaction, communication, and/or stereotypic behavior patterns or interests, but who did not meet the full DSM IV criteria for autism or another PDD. This does not necessarily mean that PDD NOS is a milder disability than the other PDDs. It could simply mean that individuals who receive this diagnosis do not meet the diagnostic criteria of the other PDDs, but that there is still a pervasive developmental disorder that affects the individual in the areas of communication, socialization, and behavior. Description of PDD NOS merely as a "subthreshold" category without a more specific case definition poses methodological problems for research regarding the relatively heterogeneous group of people who receive this diagnosis. While it is true that children diagnosed with PDD NOS, as a whole, show fewer intellectual deficits and are higher functioning than autistic children, many others who fit the criteria for PDD NOS have some autistic features but also have intellectual deficits that are so severe that it is difficult or impossible to tell whether some of the deficits come from the autism or from the severe to profound degree of intellectual disability itself. Furthermore, some others who fit the criteria for PDD NOS come to professional attention at a later age, compared to those diagnosed with autism.

In 2004, Walker et al. found that persons with PDD NOS belonged to one of three very different subgroups:
A high functioning group (around 25 percent) whose symptoms more or less overlap with that of what was Asperger syndrome, while also not meeting the then current criteria for autism spectrum disorder, but who completely differ from those with Asperger syndrome in terms of having a lag in language development and/or mild cognitive impairment.) Another group (around 25 percent) whose symptoms more closely resemble those of autism, but do not fully meet all its diagnostic signs and symptoms. This is because either the symptoms were recognized at a later age or because they were too young or have cognitive deficits that are too severe to properly identify all the symptoms of autism that they may have. The biggest group (around 50 percent) consists of those who met all the diagnostic criteria for autistic disorder but whose stereotypical and repetitive behaviors were noticeably mild.