Table 1.

Classification of autism cases in the Early Markers for Autism study^a

Autism spectrum disorder subgroups	Number of subjects
Total	84
Phenotype
Autism	55
Asperger's syndrome	0
PDD-NOS	5
Unknown	24
Onset type
Early onset	64
Regressive	17
Unknown	3
Intellectual disability
Yes	34
No	30
Unknown	20

^aPDD-NOS: pervasive developmental disorder not otherwise specified.