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Weschler's IQ Test Score Interpretation

By Inderbir Kaur Sandhu, Ph.D


Q: My son who is 11 now underwent a Wechsler IQ test few months ago. His overall score is 143. Below is the break-up of scores:

Vocabulary Raw score is 58, T score is 73
Block design Raw score 60, T score 75
Similarities raw score 38, T score is 74
Metric reasoning raw score is 28, T score is 61
Sums of T score 147, performance 136, 4 sub tests 283

Verbal Sum of T Score 147, IQ 143 percentile 99.8% Performance Sum of T score 136, IQ is 133 percentile 99% Total 4 sub test sum of T scores 283, IQ 143.

How do I interpret this? What does it mean? Please explain. Thank you.

A: Based on the overall score of 143, your son is in the highest range with superior score. This appears to be The WASI II, a revision of the WASI, which provides a brief, reliable measure of cognitive ability. The WASI II can be used in conjunction with the comprehensive Wechsler scales as a screening instrument to determine if in-depth intellectual assessment is necessary, or as a re-evaluation tool to follow up on comprehensive testing. If the WASI-II is used as a re-evaluation tool, it provides comparable FSIQ, VCI, and PRI scores to ensure interpretation of change over time is clear and meaningful.

Standard scores transform individual raw scores into a standard form that provides a more meaningful description of the individual scores within the distribution. T-scores are standard scores with a mean (average) of 50 and a standard deviation of 10. If the variable measured by a psychological test is normally distributed, we would expect that two-thirds (68.26%) of the population would obtain scores between 40 and 60. This is considered the normal range. You son obtained T scores in the range of 61 to 75, which is above average. Further, it would be expected that 95% of the distribution lies within 2 standard deviations of the mean (that is T-scores between 30 and 70). Thus, scores that fall above 70 or below 30 would be considered unusually high and unusually low, as only 5% of the population obtains higher or lower scores.

Apart from Matric Reasoning, your son scores are considered very high for the other three subsets. Your son should qualify for the gifted education programme. Speak to the school authorities to help with your son's ability-educational match.

All the best!


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