Except for Rett disorder, which occurs almost exclusively in girls, most pervasive developmental disorders (PDDs) are less common in girls than in boys. Girls with PDD tend to have slightly lower ...

Children with PDD display a variety of severe behavioral disturbances. [2] They may not speak in words or may only speak noncommunicatively (eg, echoing statements that they hear rather than ...

What is an Autism Spectrum/Pervasive Developmental Disorder? Pervasive Developmental Disorder is a broad diagnostic category that includes what are commonly referred to as "Autism Spectrum Disorders".

The symptoms of autism spectrum disorder ... Those conditions were autistic disorder, Asperger’s disorder, and pervasive developmental disorder not otherwise specified. Asperger’s disorder ...