Prior to 2013, PDD-NOS (Pervasive Developmental Disorder Not Otherwise Specified) was used for children with similarities to autistic disorder who did not meet all criteria for autistic disorder.

“and we also had something called pddn pervasive developmental disorder not otherwise specified a mouthful um anded DD NOS uh was a term we used um when um it it had simil similarities to autistic disorder um because all three of those names were under the umbrella of autism um and so there were a lot of kids who received this pddn OS because they were like something's different something's different they're sprinkled with bits of autism but they didn't quite meet all the criteria”