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Large Discrepancy between Scores of Two Tests (KBIT-2 and DAS-II)

By Inderbir Kaur Sandhu, Ph.D


Q: In January, my daughter, who was 6 years old and in 1st grade was administered a KBIT II screening and scored; Non-verbal - 148 Verbal - 133 Composite - 143

At the end of July after she turned 7, she was administered the DAS-II, and scored; Non-verbal - 107 Verbal - 120 Composite - 112

I am curious about why there is such a large discrepancy between the scores of the two tests. She displays gifted characteristics, and is doing school work 2 grade levels ahead. She was administered the tests through the school. Could either of the tests be wrong? Should I request to have her retested?

A: The KBIT-2 is a brief screening measure of intelligence comprised of two subtests: Matrices and Vocabulary. Scores from these two subtests are combined to form the IQ Composite, which serves as the measure of intelligence on the KBIT-2. This is a quick measure of intelligence. Scores between 90 and 110 are considered average. Your daughter's scores are in the “Very Superior” range

The DAS-II is a more comprehensive individually administered intelligence test for children and adolescents. As with most IQ tests, scores between 90 and 110 are considered average. Your daughter's scores are in the “Above Average” range.

The large discrepancy is definitely a concern. It is hard to tell why this could be the case. While it is true that one is a quick measure and the other a more comprehensive test, scores should not differ to that extent. All I can advise is for you to see the person in charge and get an explanation for such a difference in score range. Retesting would be advised unless they are able to come up with a valid reason for the large discrepancy. All the best!


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