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Summary

The Quantified Behavior Test Plus (Qb+) shows a reliable structure for measuring attention deficit/hyperactivity disorder (ADHD) symptoms. While its validity is partially supported, specific inattention measures effectively differentiate between individuals with and without ADHD.

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Area of Science:

  • Psychology
  • Neuroscience
  • Clinical Assessment

Background:

  • Attention deficit/hyperactivity disorder (ADHD) diagnosis relies on subjective measures.
  • Objective assessment tools are needed to evaluate core ADHD symptoms: hyperactivity, inattention, and impulsivity.

Purpose of the Study:

  • To investigate the factorial structure and validity of the Quantified Behavior Test Plus (Qb+).
  • To assess the Qb+'s ability to objectively evaluate the three core ADHD symptoms independently.

Main Methods:

  • Confirmatory and exploratory factor analyses on a sample of 773 subjects (≥12 years).
  • Multitrait-multimethod analysis on a second sample of 297 patients (≥16 years) for validity assessment.
  • Logistic regression and general linear models to evaluate discriminative power.

Main Results:

  • Confirmatory factor analysis verified the three-factor structure (Hyperactivity, Inattention, Impulsivity) with good model fit.
  • Convergent validity was met; discriminant validity was partially supported.
  • Omission errors and reaction time variability (Inattention factor) discriminated between ADHD and non-ADHD subjects.

Conclusions:

  • The Qb+ demonstrates a verified internal structure and partially supported validity.
  • The Qb+ shows potential as an objective tool for ADHD assessment, particularly for inattention symptoms.