IQ Equivalent Of Percentile Score for SIT
By Inderbir Kaur Sandhu, Ph.D
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?
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: