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.
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.
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.
Full Scale IQ Score
A measure of the child's global intellectual functioning is derived from the subtests administered on the Wechsler test.
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%
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