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Interpretation of the Slosson Intelligence Test

By Inderbir Kaur Sandhu, Ph.D

Q: My son, who is 7 years old, took the Slosson Intelligence Test at the end of 1st grade. His "full scale or composite score" was a 160. I would like someone to be able to explain what the score means.

A: The Slosson Intelligence Test (SIT) serves as a quick estimate of general verbal cognitive ability or index of verbal intelligence. This test was designed to facilitate the screening of children at risk (i.e., of educational failure) by providing a quick estimate of mental ability, and to identify children who may be appropriate candidates for deeper testing services (such as gifted children). This test is suitable for screening purposes, although it has been recommend that additional (short form) of other comprehensive intelligence test batteries that are more psychometrically sound be used for detailed understanding of general intelligence. The Cognitive Areas of Measurement include: Vocabulary, General Information, Similarities and Differences, Comprehension, Quantitative, Skills and Auditory Memory.

I am not very familiar with the scoring system but based on my knowledge, a score of 160 is very high on the SIT. The WISC and Stranford-Binet usually have cut-off point of between 124-129 to screen gifted children. Research has indicated the SIT to use scores above that to screen these children, with the average being about 134 for the revised SIT. However, it has also been documented that the top range of SIT goes up to 164. So with this as a benchmark, I believe your son is in the top range based on his scores. You may want to do further and more detailed testing using the more standardised WISC or the Stranford-Binet. The interpretation is much more detailed and would help you and the school decide on the best ways to educate him to his maximum potential. Good luck!


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