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


Dyck, MJ and Piek, JP and Patrick, J, The validity of psychiatric diagnoses: The case of 'specific' developmental disorders, Research in Developmental Disabilities, 32, (6) pp. 2704-2713. ISSN 0891-4222 (2011) [Refereed Article]

Copyright Statement

Copyright 2011 Elsevier.

DOI: doi:10.1016/j.ridd.2011.06.001


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.

Item Details

Item Type:Refereed Article
Keywords:psychiatric diagnosis, validity, developmental disorders, developmental coordination disorder, mixed receptive-expressive language disorder
Research Division:Health Sciences
Research Group:Health services and systems
Research Field:Mental health services
Objective Division:Health
Objective Group:Public health (excl. specific population health)
Objective Field:Mental health
UTAS Author:Patrick, J (Dr Jeff Patrick)
ID Code:78359
Year Published:2011
Web of Science® Times Cited:16
Deposited By:Faculty of Business
Deposited On:2012-06-22
Last Modified:2017-11-07

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