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Raw values were expressed in percentiles (derived from age-matched norm samples), in order to achieve age-independent test scores.
This is achieved by quantitatively comparing problem behavior scores of the target group with scores of control groups (i.e., children with healthy parents) or non-clinical norm samples when studies omitted controls.
For example, children in a study by Patterson et al. had ECBI scores of three-quarters of a standard deviation above the norm; samples in other studies using community samples are similar (ECBI scores 1.5 SDs above the mean; >75th percentile on a paediatric behaviour problems screener).
Similar(57)
Percentiles were based on a preliminary norm sample of about 300 adolescents and young adults.
Their mean reading quotient (M = 100, SD = 15) based on the norm sample was below 70, whereas that of the nonimpaired readers was about average.
A national norm sample was compared on the SF-36.
The factor scores were further converted into IQ scores using the Austrian norm sample.
All patients were under the mean scores of the German norm sample.
JCA was responsible for data from the Norwegian norm sample and discussion of the results.
With norm based scoring, results in any given sample are analyzed in relation to the norm sample – values above 50 indicating better health and values below 50 indicating worse health than the norm sample [ 34].
The SF-12v2 was analyzed in comparison to the U.S. American norm sample and a representative German sample.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com