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The Woodcock Johnson III (WJ III) Score

By Inderbir Kaur Sandhu, Ph.D

Q: Hello, my son Gabriel was tested when he was 5 years and seven months old. I never really looked at his IQ scores just thinking he was just "gifted" and letting the people at his school handle that. But I found the copy of his results that we keep in the house for reference, and I found that in his broad mathematics area of his Woodcock Johnson three test he scored a percentile that looked like this >99.9%. He also received a standard score of 161. In reading, his percentile was 99.8% with a standard score of 148. What do these score mean? Thanks.

A: The Woodcock Johnson III (WJ III) measures many aspects of academic achievement with a wide variety of relatively brief tests. The standard score (SS) communicates relative standing in a peer group which describes the individual performance relative to the average performance of the comparison group in the norming sample (by age or grade).

Based on your son's standard score and percentile rank, he is in the “very superior” range which starts from 131 and above. The graph below indicates the range:

Standard Score Range Percentile Rank Range Classification
131 and above 98 to 99.9 Very Superior
121 to 130 92 to 97 Superior
111 to 120 76 to 91 High Average
90 to 110 25 to 75 Average
80 to 89 9 to 24 Low Average
70 to 79 3 to 8 Low
69 and below 0.1 to 2 Very Low

Hope that helps to understand the score.


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