A proposed new definition of autism is sure to spark an outcry among parents, professionals and many currently diagnosed with Asperger’s Syndrome and Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS). An expert panel appointed by the American Psychiatric Association is currently reviewing the new definition, which is to appear in May of 2013 in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders, the standard reference for mental disorders in the US. DSM criteria are used in making decisions about research studies, insurance coverage and treatment decisions, so these changes could have a very real impact on people’s lives.
Changes in Diagnostic Criteria and the “Autism Epidemic”
Diagnoses of autism, once considered an extremely rare condition, as well as of related conditions including PDD-NOS and Asperger’s Syndrome, started to increase significantly in the 1980s. Autism is now said to occur in 1 to 100 individuals according to figures from the Center for Disease Control and Prevention; a recent study of school children in South Korea found an even higher rate of 1 in 38 children meeting diagnostic criteria for autism. On seeing such high rates in a condition once estimated to occur in 1 in 10,000 children, some have declared an “autism epidemic.” Some have speculated that various environmental causes were the reason while others have pointed to the expanded diagnostic criteria.
The diagnostic criteria for autism were significantly broadened in the 1987 DSM-R; a child now had to display 8 out of 16 criteria in the areas of social and communicative impairment and in repetitive behaviors. The DSM-IV (1994) and DSM-IVR (2000) specified that a person had to present with six out of twelve criteria in such areas.
New Proposed Criteria Could Exclude Many Now Diagnosed With Autism, PDD-NOS, Asperger’s
The new proposed criteria in the DSM-V introduce a new diagnosis, autism spectrum disorder, that will encompass a number of current diagnoses, Autistic Disorder, Asperger’s Disorder, Childhood Disintegrative Disorder, and Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS). The proposed definition can be seen as making the criteria for diagnosis more precise, as they require that an individual present with three deficits in social interaction and communication specifically and at least two repetitive behaviors, to receive an autism spectrum disorder diagnosis.
The first study about the proposed DSM-V criteria have indeed been found to be likely to exclude many who are now diagnosed with autism or related conditions. The “vagueness” of the DSM-IV criteria have, it is thought, led to too many being dignosed with autism. The New York Times summarizes the study:
In the new analysis, Dr. [Fred R. Volkmar, the director of the Child Study Center at Yale University School of Medicine], along with Brian Reichow and James McPartland, both at Yale, used data from a large 1993 study that served as the basis for the current criteria. They focused on 372 children and adults who were among the highest-functioning and found that over all, only 45 percent of them would qualify for the proposed autism spectrum diagnosis now under review. The focus on a high-functioning group may have slightly exaggerated that percentage, the authors acknowledge.
The likelihood of being left out under the new definition depended on the original diagnosis: About a quarter of those identified with classic autism in 1993 would not be so identified under the proposed criteria; about three quarters of those with Asperger’s would not qualify; and 85 percent of those with P.D.D.-N.O.S. would not.
The researchers are undertaking a broader analysis that will include 1,000 cases.
All of this may seem overly academic. But the DSM is not called a “Bible” for nothing.
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