The structure of adult ADHD

Area of Science:

• Psychiatry
• Neuroscience
• Psychology

Background:

• The Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) criteria for attention-deficit hyperactivity disorder (ADHD) do not differentiate adult and child symptom presentation.
• Clinical observations suggest adults with ADHD experience more complex executive functioning and emotional regulation deficits than children.

Purpose of the Study:

• To analyze the structure of adult ADHD symptoms using an expanded symptom set.
• To determine if executive dysfunction and emotional dyscontrol are integral components of adult ADHD.
• To compare empirically derived symptom profiles with DSM-5 classifications.

Main Methods:

• Utilized exploratory factor analysis on pooled data from three diverse US adult samples (national household, health plan members, ADHD clinic referrals).
• Examined a comprehensive set of adult ADHD symptoms, including those beyond the current DSM-5 criteria.
• Developed empirically-derived multivariate symptom profiles.

Main Results:

• Identified four core factors: executive dysfunction/inattention, hyperactivity, impulsivity, and emotional dyscontrol.
• Executive dysfunction/inattention included all DSM-5 inattentive symptoms and additional non-DSM symptoms.
• Symptom profiles aligned with DSM-5 presentations but highlighted the centrality of executive dysfunction and the distinct role of emotional dyscontrol in combined presentations.

Conclusions:

• Executive dysfunction is a core feature of adult ADHD, as significant as DSM-5 symptoms.
• Emotional dyscontrol is a distinct but relevant aspect of the combined presentation of adult ADHD.
• Findings support a broader conceptualization of adult ADHD that includes executive and emotional regulation deficits.