Understanding
speech and language testing scores takes you back to the basics of statistics
and the bell curve. Typically,
speech-language testing scores are based on normative sampling in which test
makers administer the test to a large group of children. Your child’s scores are compared to the
sample to see how their skills compare to peers. With most speech-language tests, you can
expect to derive the following scores:
Raw Score: The raw score is
typically either the total number correct or the total number of errors.
Standard Score: The
standard score is determined by the raw score and is a conversion that allows
for comparison to the normative sample.
The median standard score is 100.
The standard score and percentile rank essentially provide the same
information, but most people find the percentile rank to provide a clearer
benchmark for their child.
Percentile Rank: The
percentile rank is also determined by the raw score. It tells you the percentage of peers your
child scored above. For example, a
percentile rank of 40% means that your child performed higher than 40% of
peers. The median percentile rank is
50%. The following guideline can be used
for understanding the significance of percentile ranks:
1-16%
|
Below Average
|
Your child may have a severe delay.
|
17-49%
|
Low Average
|
Your child may have a mild or moderate
delay.
|
50-99%
|
High/Above Average
|
Your child does not have a delay.
|
Test Age-Equivalent: A
test age equivalent is also derived from the raw score. It indicates the age to which your child’s
skills can best be most compared. This
score should be interpreted with some caution since sometimes a delay in skills
also involves a difference in skills. For
instance, a child who is 4 years old and receives an age-equivalency of 3 years
old may present differently than a typical 3-year-old child. Age equivalencies are best used as severity
measures for this reason.
For more information on our Evaluations & Therapy, or to schedule a visit for your child, visit www.TeamChatterboxes.com
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