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IQ Equivalent Of Percentile Score for SIT
By Inderbir Kaur Sandhu, Ph.D
Q: My 6-year-old daughter scored in the 99th percentile on the Slosson Intelligence Test. I assume that's good, but I am wondering what exactly that means. Is there a number equivalent that goes with that percentage? And/or an IQ equivalent?
A: Different tests convert percentiles differently and we use a manual strictly to get the best possible estimates. 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. It is at best used a decent quick estimate of intelligence.
Percentile is an age-based or grade-based score indicating the percent of the norm group of students tested who scored less than the student. Based on the percentile, your daughter scored as well or better than 99% of individuals of the same age. This means that she would be in the top 1% range. I would think that based on the estimates then, your daughter could have an IQ score of above 130 (its estimated that 97th percentile is the same as standard or IQ score of 130 or above) which places her in the Superior range of abilities.
It is best to get the latest test done as tests these days are have higher reliability and validity. Furthermore, being a brief test, the SIT does not tell you much about your strengths and weaknesses. Some reading on this test:
http://aac.ncat.edu/newsnotes/y01win.html
Good luck!
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