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Validity of ADHD Subtypes Using Neuropsychological Measure

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: July 2, 2007
Last Update Posted: November 14, 2012
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
National Taiwan University Hospital

Background: Attention-Deficit/Hyperactivity Disorder (ADHD), characterized by inattention, hyperactivity, and impulsivity, is among the most common neuropsychiatric disorders worldwide (5-10% at school age) and in Taiwan (7.5%). The DSM-IV ADHD consists of three subtypes: predominantly Inattentive (ADHD-I), predominantly Hyperactivity/Impulsivity (ADHD-H), and Combined subtypes (ADHD-C). Although the DSM-IV field trials indicate that the current subtypes differ significantly on variables such as age of onset, gender ratio, and level of social and academic impairment, little has been addressed whether the DSM-IV subtypes differ neuropsychologically. Numerous researches have proved that stimulants (methylphenidate is the only stimulant in Taiwan) are the most effective medication in treating ADHD. Although the efficacy of methylphenidate on behavioral measures has been established in Taiwan, there is no information about neuropsychological measures.

Specific Aims:

  1. to validate ADHD subtype by neuropsychological measures; and
  2. to investigate the efficacy of methylphenidate on the improvement of executive functioning among children with ADHD.

Subjects and Methods: Participants will consist of 20 children with ADHD-C, 20 with ADHD-I, 10 with ADHD-H and 50 controls without ADHD in the age range of 7 to 10. The measures include the psychiatric interviews (Chinese K-SADS-E), neuropsychological tests (WISC-III, Cancellation Test, Digit Span, Trail Making Test, CPT, Circle Tracing Test), self-administered rating scale (SNAP-IV), and investigator administered assessment (CGI and Behavior Observation Ratings).

Anticipated Results: We anticipated that children in the ADHD and non-ADHD group will perform differently on the neuropsychological tests with more deficits in neuropsychological functions in the ADHD group. Also, we expected that methylphenidate will improve the performance on the neuropsychological tests and reduce the behavioral symptoms of ADHD children. Subtypes difference in the neuropsychological functions is also expected.

Attention-deficit/Hyperactivity Disorder

Study Type: Observational
Study Design: Observational Model: Case Control
Official Title: Discriminate Validity of ADHD Subtypes Using Neuropsychological Test

Resource links provided by NLM:

Further study details as provided by National Taiwan University Hospital:

Enrollment: 122
Study Start Date: September 2005
Study Completion Date: August 2006
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Information from the National Library of Medicine

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Ages Eligible for Study:   7 Years to 10 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
children with ADHD

Inclusion Criteria:

  • patients who have clinically diagnosis of DSM-IV ADHD confirmed by the K-SADS-E, are aged 7-10, and have IQ > 80; and who and whose parents consent to this study

Exclusion Criteria:

  • if they have a history of brain injury or epilepsy, visual/auditory deficit or were diagnosed as having motor disorder, obsessive-compulsive disorder, mental retardation, mood disorders, pervasive developmental disorder, or schizophrenia
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00494819

National Taiwan Univeristy Hospital
Taipei, Taiwan, 10002
Sponsors and Collaborators
National Taiwan University Hospital
Principal Investigator: Susan Shur-Fen Gau, MD, PhD National Taiwan University Hospital & College of Medicine
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: National Taiwan University Hospital
ClinicalTrials.gov Identifier: NCT00494819     History of Changes
Other Study ID Numbers: 9461700916
NSC 94-2815-C-002-177-H ( Other Identifier: National Science Council )
First Submitted: June 29, 2007
First Posted: July 2, 2007
Last Update Posted: November 14, 2012
Last Verified: August 2008

Keywords provided by National Taiwan University Hospital:
ADHD, subtype, methylphenidate, neuropsychological measures

Additional relevant MeSH terms:
Attention Deficit Disorder with Hyperactivity
Attention Deficit and Disruptive Behavior Disorders
Neurodevelopmental Disorders
Mental Disorders