Defining ADHD symptom persistence in adulthood: optimizing sensitivity and specificity

Area of Science:

• Child and Adolescent Psychiatry
• Neurodevelopmental Disorders
• Longitudinal Research

Background:

• Attention-Deficit/Hyperactivity Disorder (ADHD) persistence into adulthood is highly variable.
• Existing studies report a wide range of ADHD persistence rates (5-75%).
• The influence of assessment methodology on reported persistence rates is not well understood.

Purpose of the Study:

• To investigate how information source, assessment method, and symptom threshold impact reported ADHD persistence rates in adulthood.
• To identify optimal methods for assessing adult ADHD persistence.

Main Methods:

• Longitudinal study of 579 children diagnosed with ADHD-Combined Type.
• Adult follow-up evaluations included parent and self-reports via rating scales and structured interviews.
• Comparison with a local normative comparison group (LNCG).

Main Results:

• Higher persistence rates were observed with parent reports versus self-reports.
• Structured interviews yielded higher rates than rating scales for self-reports.
• A norm-based (NB) threshold of 4 symptoms resulted in higher rates than DSM criteria.
• Receiver-Operating Characteristics (ROC) analysis indicated optimal sensitivity and specificity with combined parent/self-reports on rating scales and a NB threshold.

Conclusions:

• The interview format enhances young adult self-reporting when parental input is unavailable.
• Combining parent and self-reports from rating scales with an 'or' rule and NB threshold balances sensitivity and specificity.
• Using this optimized definition, 60% of the ADHD group exhibited symptom persistence, and 41% met criteria for both symptoms and impairment in adulthood.