There is a big difference really. PDD-NOS is a developmental delay that will impair communication and social skills like empathy. They may also display similar behavior to children with Autism, but on a reduced level. Think of PDD-NOS as Autism-light. ADD is more of a 'learning disorder' which is probably seen by most others as a 'behavior problem'. Here are their definitions.
PDD-NOS
PDD NOS will present similarly to the kids who have autism (some people argue that these conditions should be combined as one), but will have a lesser degree of a severe impairment. These kids are more likely to be verbal and have some degree of verbal or non-verbal effective communication, yet they must have the autistic features (as per the DSM IV criteria) and a severe impairment in social interaction, communication, or repetitive stereotype behavior. This term is reserved for children with a severe impairment who do not fully qualify for any other autistic diagnosis, due to age of onset or combination of autistic features.
ADD
An attention-deficit disorder (ADD) is a developmental disorder characterized by developmentally inappropriate degrees of inattention, overactivity, and impulsivity. Symptoms are neurologically-based, arise in early childhood, and are chronic in nature in most cases. Symptoms are not due to gross neurological impairment, sensory impairment, language or motor impairment, mental retardation, or emotional disturbance.
Three main traits characterize ADD: (1) poor sustained attention or vigilance; (2) impulsivity or difficulty delaying gratification; and (3) hyperactivity or poorly regulated activity. Increased variability of task performance and problems complying with rules are often key features.
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