Under the DSM-IV, autism was divided into four distinct diagnostic criterias: Autistic Disorder, Asperger’s Disorder, Pervasive Developmental Disorder – Not Otherwise Specified (PDD-NOS), and Childhood Disintegrative Disorder.

Since 2013, under the DSM-5, Autism Spectrum Disorder (ASD) is regarded as a spectrum, which recognises that everyone’s experience of autism is different across the diagnostic criteria.

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