Diagnostic Criteria

	Autistic Disorder
_______	At least two symptoms in Cluster 1 (Social) DSM-IV-TR checklist relative to developmental level
	AND
_______	At least one symptom in Cluster 2 (Communication)
	AND
_______	At least one symptom in Cluster 3 (Repetitive and/or Restricted Interests and Behaviors)
	AND
________	Child displays SIX OR MORE total symptoms
	AND
________	Onset was before age three years
	AND
________	Child’s age equivalence must be 12 months or higher on at least one of the following: Mullen Visual Reception, Receptive Language, or Expressive Language
	ASD-Low MA
________	Child displays at least 1 symptom from Cluster 1 (Social): must have 1 symptom other than lack of interest in peers
	AND
________	Child displays at least 1 other symptom from Cluster 2 (Communication) and/or Cluster 3 (Repetitive and/or Restricted Interests and Behaviors)
	AND
________	Child’s Mullen scores on Visual Reception, Receptive Language, and Expressive Language and Vineland scores on Communication and Social subdomains are ALL less than or equal to 12 months age equivalent
Pervasive Developmental Disorder – Not Otherwise Specified (PDD-NOS)
_______	At least one symptom in Cluster 1 (Social) DSM-IV-TR checklist relative to developmental level:
	_______	CANNOT include ONLY 1b (peer relationships) for Time 1 evaluations
	AND
_______	At least one symptom in Cluster 2 (Communication) and/orCluster 3 (Repetitive and/or Restricted Interests and Behaviors)
	AND
________	Child does not meet criteria for Autistic Disorder, Asperger’s Disorder, or Rett’s Syndrome
	AND
________	Symptoms noted on checklist cannot be better accounted for by another disorder (e.g., reactive attachment disorder, sensory or motor impairments, etc.)
	AND
________	Child’s age equivalence must be 12 months or greater on at least one of the following: Mullen Visual Reception, Receptive Language, or Expressive Language
	AND
________	Child displays clinically significant impairment in home, school, and/or community settings
	Developmental Delay
_______	Delay of at least 1.5 standard deviations on AT LEAST ONE of the following (“non-language”):
	________	Mullen Visual Reception (T-score=35 or less)
	________	Mullen Fine Motor (T-score=35 or less)
	________	Vineland Motor Skills (SS=77 or less)
	AND
_______	Delay of at least 1.5 standard deviations on AT LEAST ONE of the following (“Language”):
	________	Mullen Expressive Language (T-score=35 or less)
	________	Mullen Receptive Language (T-score=35 or less)
	________	Vineland Communication (SS=77 or less)
	AND
________	At least one from the 2 categories above must be a delay on the Mullen
	Other Diagnosis
________	DOES NOT meet criteria for an ASD diagnosis
	AND
________	Meets criteria for a non-ASD DSM-IV-TR diagnosis, such as ADHD, ODD, Reactive Attachment Disorder, an anxiety disorder, a mood disorder, or some other psychological condition: Specify: ______________________
	No Diagnosis
________	Meets criteria for a non-DSM-IV-TR disorder or condition (e.g., sensory processing difficulties): Specify: ________________________
	OR
________	DOES NOT meet criteria for any DSM-IV-TR or study diagnoses, but DOES NOT meet criteria for Typical Development (include children who cannot complete reliable/valid testing due to non-compliance here)
	AND
________	Child displays sub-syndromic characteristics of a condition (reserve for clinically significant motor and/or speech-language difficulties that do not meet diagnostic criteria but present as clinically significant)