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Anxiety : Tension or nervousness felt prior to the occurrence of a real or imagined event.

Asperger Syndrome (AS) : One of the conditions considered a Pervasive Developmental Disorder (PDD) or Autism Spectrum Disorder (ASD).  AS is characterized by marked and sustained social and behavioural impairments but no significant cognitive or language delays.

Keyword(s): Asperger Syndrome

Autism : One of the conditions considered a Pervasive Developmental Disorder (PDD) or Autism Spectrum Disorder (ASD). Autism is characterized by marked difficulty in communication and social relations and by the presence of atypical behaviours.

Autism Spectrum Disorder : Terms used to refer to any disorder in the array of Pervasive Developmental Disorders (PDDs). Used to refer to any of these developmental disorders, including Autism, Rett Syndrome, Childhood Disintegrative Disorder (CDD), Asperger Syndrome (AS), and Pervasive Developmental Disorder-Not Otherwise Specified (PDD-NOS).

Keyword(s): Autism SpectrumDisordersASD

Casein : A chemical found in milk that is sometimes related to allergic reactions.

Chelation : Chelation involves the binding of heavy metals or other toxins in the blood using drugs with a high affinity for these compounds. The use of chelation for people with ASD is very controversial.

Childhood Disintegrative Disorder (CDD) : Children with CDD develop symptoms resembling autism but do so after a period of normal development  - age of onset prior to 10 years of age.  CDD is very rare.

Keyword(s): Childhood Disintegrative Disorder

Chronological Age (CA) : The child’s actual age from birth date in months and years.

Concrete Language : Specific, literal word usage rather than metaphorical or figurative language .

Developmental : Related to skills and behaviour typical for given age ranges.

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