ADHD versus Autism comparison chart
 | ADHD | Autism |
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| Medical Classification | ADHD is of 3 types, ADHD-I (erstwhile ADD); ADHD, Predominantly Hyperactive-Impulsive Type; and ADHD, , Combined Type: Inattentive and hyperactive/impulsive |
Autism is of 4 types, PDD-NOS, Asperger's Syndrome, Landau Kleffner Syndrome, Rett Syndrome |
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| Behaviour | People with these hyperactive/impulsive behaviors may play and interact loudly. They have difficulty staying in their seat, talk excessively, and have trouble waiting turns. They may seem to be perpetually “on the go.” |
People with this neurological disorder may rock, flap, screech, language impairment, and they might be socially impaired. |
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