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Wechsler Tests Percentile Rank (WAIS)

By Inderbir Kaur Sandhu, Ph.D


Q: I wanted to know what each of these scores mean in terms of percentile rank, so could you please explain each of the score for me? Please and thank you!

WAIS-IV (Wechsler Adult Intelligence Scale IV):

Full Scale IQ
Percentile rank: 50

Verbal Comprehension Index
Percentile rank: 30

Perceptual Reasoning Index
Percentile rank: 55

Working Memory Index
Percentile rank: 62

Processing Speed Index
Percentile rank: 52

A: On most standardized tests, an IQ of 100 is at the 50th percentile. These tests are standardized with a mean score of 100 and a standard deviation of 15. So at 50th percentile, it indicates an average score. Below is a guide to the classification ratings based on composite scores and percentile rank.

A GUIDE TO PERCENTILE RANKS & CLASSIFICATION RATINGS
(Wechsler Tests)

IQ Percentile Range Classification
130 and above 98 to 99.99 Very Superior
120 to 129 91 to 97 Superior
110 to 119 75 to 90 High Average
90 to 109 25 to 73 Average
80 to 89 9 to 23 Low Average
70 to 79 2 to 8 Borderline
69 and below .01 to 2 Intellectual Deficient

The percentile rank reflects the percentage of scores that are lower than an obtained test score. For example, a score at the 75th percentile rank is higher than that obtained by 74% of the population. In other words, the individual obtaining this test score scored higher than 74% of the individuals in the standardization group. In other words, for overall score (FSIQ) at 50th percentile it shows that the individual scored better than half (50%) of the population based on the sampling norm. For Verbal Comprehension, the individual scores higher than 29% of individuals in that group and so on for the rest of the scores. Check against the table to see where the individual stands based on each of the classification. All the scores appear to be in the Average range. Hope that helps.


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