Interpreting intelligence test results for children with disabilities: is global intelligence relevant?

Area of Science:

• Child Psychology
• Neuropsychology
• Educational Psychology

Background:

• School psychological evaluations often use intellectual assessments to identify children with disabilities.
• The clinical utility of traditional intellectual assessment for diagnosis and intervention is debated.
• Alternative approaches like response to intervention and global score interpretation have been proposed.

Purpose of the Study:

• To examine the structure of intellectual functioning in children with Learning Disability (LD), Attention-Deficit/Hyperactivity Disorder (ADHD), and Traumatic Brain Injury (TBI).
• To determine if intellectual functioning is best represented by global scores or distinct factors for these populations.
• To provide evidence supporting or refuting the practice of idiographic interpretation in child neuropsychological evaluations.

Main Methods:

• Regression commonality analysis was employed.
• The study analyzed intellectual functioning data from children diagnosed with LD (n=128), ADHD (n=71), and TBI (n=29).
• The analysis focused on the shared and unique variance among predictors of Full Scale IQ (FSIQ).

Main Results:

• Results indicated a multifactorial structure of intellectual functioning across all diagnostic groups (LD, ADHD, TBI).
• Little shared variance was found among the factor predictors of FSIQ within each group.
• Evidence for a global intellectual functioning score, represented by shared variance, was largely absent.

Conclusions:

• Intellectual functioning in children with LD, ADHD, or TBI is composed of discrete elements rather than a singular global score.
• Idiographic interpretation of intellectual subtests is supported by these findings for individualized diagnosis and intervention.
• The study validates the continued use of detailed, individualized analysis in school neuropsychological evaluations for children with disabilities.