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The pervasive developmental disorders were: [4] Pervasive developmental disorder not otherwise specified (PDD-NOS), which includes atypical autism, and is the most common (47% of autism diagnoses); [10] Typical autism, the best-known; Asperger syndrome (9% of autism diagnoses); Rett syndrome; and; Childhood disintegrative disorder (CDD).
The Child and Adolescent Symptom Inventory (CASI) is a behavioral rating checklist created by Kenneth Gadow and Joyce Sprafkin that evaluates a range of behaviors related to common emotional and behavioral disorders identified in the Diagnostic and Statistical Manual of Mental Disorders (DSM), including attention deficit hyperactivity disorder, oppositional defiant disorder, conduct disorder ...
PDD-NOS was one of four disorders collapsed into the diagnosis of autism spectrum disorder in the DSM-5, [3] and also was one of the five disorders classified as a pervasive developmental disorder (PDD) in the DSM-IV. [4] The ICD-10 equivalents also became part of its definition of autism spectrum disorder, as of the ICD-11.
The Modified Checklist for Autism in Toddlers (M-CHAT) is a psychological questionnaire that evaluates risk for autism spectrum disorder in children ages 16–30 months. The 20-question test is filled out by the parent, and a follow-up portion is available for children who are classified as medium- to high-risk for autism spectrum disorder.
[24] [25] The ADI-R is a semi-structured parent interview that probes for symptoms of autism by evaluating a child's current behavior and developmental history. The ADOS is a semi-structured interactive evaluation of ASD symptoms that is used to measure social and communication abilities by eliciting several opportunities for spontaneous ...
The scientific study of the causes of developmental disorders involves many theories. Some of the major differences between these theories involves whether environment disrupts normal development, if abnormalities are pre-determined, or if they are products of human evolutionary history which become disorders in modern environments (see evolutionary psychiatry). [5]
The scale was designed to help differentiate children with autism from those with other developmental delays, such as intellectual disability. Although there is no gold standard among rating scales in detecting autism, CARS is frequently used as part of the diagnostic process.
In 1987, the DSM-III-R provided a checklist for diagnosing autism. In May 2013, the DSM-5 was released, updating the classification for pervasive developmental disorders. The grouping of disorders, including PDD-NOS, autism, Asperger syndrome, Rett syndrome, and CDD, has been removed and replaced with the general term of Autism Spectrum ...