The validity of psychiatric diagnoses: the case of 'specific' developmental disorders.

Abstract

We tested whether developmental coordination disorder (DCD) and mixed receptive expressive language disorder (RELD) are valid diagnoses by assessing whether they are separated from each other, from other childhood disorders, and from normality by natural boundaries termed zones of rarity. Standardized measures of intelligence, language, motor skills, social cognition, and executive functioning were administered to children with DCD (n = 22), RELD (n = 30), autistic disorder (n = 30), mental retardation (n = 24), attention deficit/hyperactivity disorder (n = 53) and to a representative sample of children (n = 449). Discriminant function scores were used to test whether there were zones of rarity between the DCD, RELD, and other groups. DCD and RELD were reliably distinguishable only from the mental retardation group. Cluster and latent class analyses both resulted in only two clusters or classes being identified, one consisting mainly of typical children and the other of children with a disorder. Fifty percent of children in the DCD group and 20% in the RELD group were clustered with typical children. There was no evidence of zones of rarity between disorders. Rather, with the exception of mental retardation, the results imply there are no natural boundaries between disorders or between disorders and normality.

• Authors: Murray J Dyck, Jan P Piek, Jeff Patrick
• Journal: Research in developmental disabilities (Res Dev Disabil) 2011 Nov-Dec Vol. 32 Issue 6 Pg. 2704-13 ISSN: 1873-3379 [Electronic] United States
• PMID: 21705192 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Validation Study)
• Copyright: Copyright © 2011 Elsevier Ltd. All rights reserved.

Topics

• Adolescent
• Attention Deficit Disorder with Hyperactivity (diagnosis, psychology)
• Autistic Disorder (diagnosis, psychology)
• Child
• Child Psychiatry (methods, standards)
• Child, Preschool
• Developmental Disabilities (diagnosis, psychology)
• Diagnostic and Statistical Manual of Mental Disorders
• Female
• Humans
• Intellectual Disability (diagnosis, psychology)
• Intelligence Tests
• Language Development Disorders (diagnosis, psychology)
• Language Tests
• Male
• Memory, Short-Term
• Motor Skills Disorders (diagnosis, psychology)
• Psychiatric Status Rating Scales
• Reproducibility of Results