Intra-subject variability in attention-deficit hyperactivity disorder

Klein, Christoph; Wendling, Katharina; Huettner, Paul; Ruder, Hans; Peper, Martin (2006). Intra-subject variability in attention-deficit hyperactivity disorder. Biological psychiatry, 60(10), pp. 1088-97. New York, N.Y.: Elsevier 10.1016/j.biopsych.2006.04.003

Full text not available from this repository. (Request a copy)

BACKGROUND: This study is based on a comprehensive survey of the neuropsychological attention-deficit hyperactivity disorder (ADHD) literature and presents the first psychometric analyses of different parameters of intra-subject variability (ISV) in patients with ADHD compared to healthy controls, using the Continuous Performance Test, a Go-NoGo task, a Stop Signal Task, as well as N-back tasks. METHODS: Data of 57 patients with ADHD and 53 age- and gender-matched controls were available for statistical analysis. Different parameters were used to describe central tendency (arithmetic mean, median), dispersion (standard deviation, coefficient of variation, consecutive variance), and shape (skewness, excess) of reaction time distributions, as well as errors (commissions and omissions). RESULTS: Group comparisons revealed by far the strongest effect sizes for measures of dispersion, followed by measures of central tendency, and by commission errors. Statistical control of ISV reduced group differences in the other measures substantially. One (patients) or two (controls) principal components explained up to 67% of the inter-individual differences in intra-individual variability. CONCLUSIONS: Results suggest that, across a variety of neuropsychological tests, measures of ISV contribute best to group discrimination, with limited incremental validity of measures of central tendency and errors. Furthermore, increased ISV might be a unitary construct in ADHD.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Service Sector > Institute of Legal Medicine > Forensic Psychiatric Services

UniBE Contributor:

Peper, Martin










Factscience Import

Date Deposited:

04 Oct 2013 14:51

Last Modified:

06 Dec 2013 13:44

Publisher DOI:


PubMed ID:


Web of Science ID:


URI: (FactScience: 13506)

Actions (login required)

Edit item Edit item
Provide Feedback