[Psychometric properties of a grammatical comprehension test]

Area of Science:

• Linguistics
• Psychometrics
• Clinical Psychology

Context:

• The Grammatical Structures Comprehension Test (CEG) is a tool for evaluating language alterations.
• It is designed for Spanish-speaking children and adults with conditions like specific language impairment, aphasia, or traumatic brain injury.
• The CEG aims to provide a rapid and simple assessment method.

Purpose:

• To evaluate the psychometric properties of the CEG.
• Specifically, to assess its reliability, validity, and discrimination rates.
• To confirm its utility in clinical practice.

Summary:

• The CEG was administered to 1,404 children, with criterion validity assessed in 181 children using additional tests.
• Analysis of discrimination rates showed that over half of the test items effectively differentiate between high and low scoring children (rate > 0.3).
• Fifteen out of 20 CEG blocks demonstrated strong discrimination (0.5-1), and item difficulty correlated with discrimination power across age groups.

Impact:

• The CEG is confirmed as a reliable and valid measure for grammatical comprehension assessment.
• Its established psychometric properties support its clinical utility.
• The test aids in the rapid and simple evaluation of language alterations in diverse populations.