ADHD combined type and ADHD predominantly inattentive type are distinct and unrelated disorders.
Abstract
We comprehensively reviewed research assessing differences in attention-deficit hyperactivity disorder (ADHD) subtypes to examine the possibility that ADHD/ combined type (ADHD/Q and ADHD/predominantly inattentive type (ADHD/I) are distinct and unrelated disorders. Differences among subtypes were examined along dimensions identified as being important in documenting the distinctiveness of two disorders. These include essential and associated features, demographics, measures of cognitive and neuropsychological functioning, family history, treatment response, and prognosis. Important differences among subtypes were found in several areas of study, supporting the conclusion that ADHD/C and ADHD/I may best be characterized as distinct disorders. We identify major limitations of the available research and present future directions for research.
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ADHD-C and ADHD-I are characterized by distinct patterns of symptomatic behavior, associated features and demographics.
“ADHD-C and ADHD-I are characterized by distinct patterns of symptomatic behavior, associated features and demographics [e.g., see 47].”
From Prevalence and diagnostic validity of motivational impairments and deficits in visuospatial short-term memory and working memory in ADHD subtypes (2015) · cites this paper as [47]
Among children with ADHD, those with SCT symptoms are less aggressive, more withdrawn, and more internalizing than other children with ADHD.
“there is some indication that among children with ADHD, those who also display SCT symptoms are less aggressive, more withdrawn, and display more internalizing symptoms than other children with ADHD [36-38].”
From Advancing the study of sluggish cognitive tempo via DSM, RDoC, and hierarchical models of psychopathology (2019) · cites this paper as [37]
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References 94 · Cited by 647
- Authors
- Milich, R., Balentine, A. C., & Lynam, D. R.
- Affiliations
- University of Kentucky (US)
- ORCID
- Lynam, Donald R.
- Venue
- Clinical Psychology: Science and Practice
- Published
- 2001
- Volume
- 8
- Issue
- 4
- Pages
- 463-488
- ISSN
- 0969-5893 (ISSN-L)
- 1468-2850
- OpenAlex
- W2001362670
- Cited by
- 647
- References
- 94
- Citations by year
- 2026: 8 · 2025: 9 · 2024: 15 · 2023: 10 · 2022: 10 · 2021: 20 · 2020: 26 · 2019: 17 · 2018: 17 · 2017: 21 · 2016: 33 · 2015: 27 · 2014: 44 · 2013: 39 · 2012: 45
- FWCI
- 9.79
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Clinical Psychology Science and Practice (publishedVersion)
- UKnowledge (University of Kentucky) (submittedVersion)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Attention Deficit Hyperactivity Disorder
- Social Sciences › Psychology › Neuropsychology and Physiological Psychology › Developmental and Educational Neuropsychology
- Social Sciences › Psychology › Clinical Psychology › Child and Adolescent Psychosocial and Emotional Development
- Keywords
- attention deficit hyperactivity disorder, combined type ADHD, ADHD subtypes, essential features, neuropsychological performance, cognitive function, family history (medicine), treatment response, prognosis, demographics
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