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Understanding Test Results

At Poulton Respondek Clinical Psychology we walk through the assessment results with you to ensure you have a detailed understanding of the findings, interpretations and recommendations. In addition, we have provided the information below to further assist you in reading the results of a cognitive assessment report.


Percentile Ranks


Assessment scores are usually presented in the form of percentiles. A percentile score ranks a child’s performance against his/her age-related peers (the average percentile rank is 50). For example, a child who scores at the 94th percentile is performing better than 94% of children in his/her group.


Age Equivalent Score


An average child of the age specified would score the same as your child, had he/she taken the same test.


Standard Score


A Standard Score, which is derived from a raw score, indicates how many standard deviations away the child’s score is from the mean/average for a particular age group.The average IQ is a standard score of 100 and a standard deviation of 15. An IQ of 100 is at the 50th percentile.


The average child will earn a standard score of 100. If a child scores 1 standard deviation above the mean, the standard score is 100 plus 15; i.e. 100 + 15 = 115. If the child scores 1 standard deviation below the mean, this is 100 minus 15, i.e. 100 - 15 = 85. Since a standard score of 115 is 1 standard deviation above the mean, it is always at the 84 percent level. Since a standard score of 85 is 1 standard deviation below the mean, it is always at the 16 percent level. A standard score of 130 (+2 SD) is always at the 98 percent level. A standard score of 70 (-2 SD) is always at the 2 percent level.




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Full Scale IQ Score


A measure of the child's global intellectual functioning is derived from the subtests administered on the Wechsler test.


IQ classification


Using the Wechsler intelligence tests, a child’s IQ is classified as falling within one of the following categories:


Very Superior                         130+                               98%+

Superior                                 120-129                           91-97%

High Average                        110-119                           75-90%

Average                                   90-109                           25-74%

Low Average                           80-89                               9-24%

Borderline                               70-79                               2-8%

Extremely Low                        69 and below              below 2%


Gifted Classification


115-130               Mildly Gifted

130-145               Moderately Gifted

145-160               Highly Gifted

160-180               Exceptionally Gifted

180+                   Profoundly Gifted


From "Exceptionally Gifted Children" Miraca Gross - 2003

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