Interpretation of WISC IV Scores
By Inderbir Kaur Sandhu, Ph.D
My 7 year old son is currently in the second grade. At the end of the
last school year he was recommended by his teacher for gifted testing.
In June he was given the WISC-IV by the school psychologist who has
since moved away. He was listed as being 7 years 7 months and 15 days
old at the time of testing. It is now September and I just received the
scores from his school. I am curious about his scores, but also unable
to ask the psychologist who completed the testing for an interpretation
due to her move over the summer. I am especially concerned with the
large difference between his verbal and perceptual reasoning scores, and
wonder if this could indicate a problem for him. As well as interested
in why both his subtests in working memory and processing speed have
such a seemingly large range in the scaled scores.
He is socially adept and learns most things with ease. He reads well and
went from a 1.8 reading level in September of first grade to a 4.8
reading level in May of the same year. I do not have his exact number
for this year yet. He is quick to learn new concepts in math and
verbalizes frustration with his peers when they do not do so. However,
he is also a class clown and will do almost anything to make his
classmates laugh. I have been told by both his first and second grade
teachers that he stays on task when they are working on something in
class, but that as soon as he has completed the task he talks/plays and
is disruptive to others. He also is louder and fidgety when they are
moving from one task or place to another. Such as from desks to the
carpet or walking down the hallway. He had chronic ear infections with
fluid behind the drums at a very young age as well. His ear drums have
ruptured on both sides multiple times. He had a pure tone hearing test
this week at school and I was told that he "tested within normal limits"
for the results. I do not have a copy of those results yet.
His test scores were as follows:
Similarities: raw score 11, scaled score 10
Vocabulary: raw score 27, scaled score 12
Comprehension: raw score 16, scaled score 11
Sum of scaled scores: 33
Composite score: 104
Block Design: raw score 30, scaled score 14
Picture Concepts: raw score 23, scaled score 19
Matrix Reasoning: raw score 23, scaled score 16
Sum of scaled scores: 49
Composite score: 139
Digit Span: raw score 11, scaled score 8
Letter-Number Sequence: raw score 17, scaled score 14
Sum of scaled scores: 22
Coding: raw score 41, scaled score 9
Symbol Search: raw score 34, scaled score 14
Sum of scaled scores: 23
I did not receive and interpretation on this testing. There also is not
a percentile rank or a confidence interval for any of the composite
scores. Those boxes have been left entirely blank.
It is quite strange that there is no percentile rank as it is important
to see where the child stands within the norming population. You should
find out from the school if you could get the psychologist who did the
testing to give a more comprehensive analysis of the test.
I would do a brief analysis of the scoring but will only be able to take
into account of the scores as given as above. A Full Scale IQ of 120
indicates that he is in the Superior range (right on the dot: 120-129).
His VCI, WMI and PSI scores all indicate an Average range. However, his
PRI score is in the Very Superior range. This is entirely based on the
composite scores given above.
However, I found that based on the raw scores, there has been quite a
bit of miscalculation here. This is a serious matter – please get in
touch with the school. From the raw scores, I have managed to generate
the following results with the percentile.
||Sum of Scaled Scores
||95% Confidence Interval
|Verbal Comprehension (VCI)
||93 - 107
|Perceptual Reasoning (PRI)
||123 - 138
|Working Memory (WMI)
||90 - 105
|Processing Speed (PSI)
||96 - 114
|Full Scale (FSIQ)
||109 - 119
From the above analysis, it is found that your son has a Full Scale IQ
of 114. I fail to understand how the school psychologist could have
miscalculated the raw scores – if the above scores are correct. In fact,
the whole test may not have been administered, as it should be. I
suggest you take this matter up very seriously and ask for a retest. You
may want to seek help of another psychologist to interpret the scores as
well. I wish you all the best.