Validity of the Comprehensive Learning Test for Diagnosis of Specific Reading or Mathematical Disorders

Area of Science:

• Developmental Psychology
• Educational Psychology
• Clinical Psychology

Background:

• Reading disorders (RD) and mathematical disorders (MD) significantly impact academic achievement.
• Accurate and early diagnosis is crucial for effective intervention in children and adolescents.
• The Comprehensive Learning Test (CLT) is a tool designed to assess learning abilities.

Purpose of the Study:

• To evaluate the diagnostic validity of the Comprehensive Learning Test-Reading (CLT-R) for RD.
• To assess the diagnostic validity of the Comprehensive Learning Test-Math (CLT-M) for MD.
• To determine the optimal criteria for using CLT-R and CLT-M in clinical settings.

Main Methods:

• Two studies were conducted: one with 284 participants for RD and another with 184 for MD, each including a matched control group.
• Diagnostic validity was assessed using sensitivity, specificity, positive predictive value, and negative predictive value (NPV).
• Specific criteria combining accuracy and fluency measures were applied for CLT-R and CLT-M.

Main Results:

• For RD diagnosis using CLT-R, a fluency criterion of "one impairment or one borderline score" demonstrated high validity (sensitivity=0.963, NPV=0.991).
• For MD diagnosis using CLT-M, a fluency criterion of "impairment or borderline" showed high validity (sensitivity=0.814, specificity=0.966).
• Both CLT-R and CLT-M exhibited strong performance in identifying participants with RD and MD.

Conclusions:

• The CLT-R and CLT-M are validated as reliable instruments for diagnosing RD and MD in children and adolescents.
• The study confirms the clinical utility of the CLT for identifying specific learning disorders.
• Findings support the use of specific accuracy and fluency criteria for maximizing diagnostic accuracy.