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Differentiating Attention-Deficit/Hyperactivity Disorder From Pervasive Developmental Disorder Not Otherwise Specified

Herbert Roeyers is assistant professor in clinical psychology at the University of Gent, in Gent, Belgium. His research interests are in the area of developmental and behavioral disorders in preschool children.

Heidi Keymeulen, MSc

Heidi Keymeulen is a staff member at the Mental Health Center in Ninove, Belgium.

Ann Buysse, PhD

Ann Buysse is a postdoctoral researcher for the Fund for Scientific Research at the University of Gent. Her current research interest lies in interpersonal relations and empathic accuracy. Address: Herbert Roeyers, University of Gent, Research Group Developmental Disorders, Henri Dunantlaan 2, B-9000 Gent, Belgium.

This study investigated early clinical differences between children with a diagnosis of pervasive developmental disorder not otherwise specified (PDD-NOS) and children with attention-deficit/hyperactivity disorder (ADHD). Differential diagnoses between the two disorders is often difficult in infancy or early childhood. Twenty-seven children with PDD-NOS were matched with 27 children with ADHD as to IQ and chronological age. Their parents were retrospectively questioned on pre-, peri-, and postnatal complications and on atypical or delayed development of the children between 0 and 4 years of age. This exploratory study revealed almost no differences between both groups with respect to pregnancy or birth complications. The results suggest that differences between the two groups become more pronounced and specific with growing age. Consequently, this investigation offers sufficient guidelines for more specific research with larger samples.

Journal of Learning Disabilities, Vol. 31, No. 6, 565-571 (1998)
DOI: 10.1177/002221949803100606


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