The three versions of the KIDSCREEN (KIDSCREEN-10, -27 & -52) were developed on the basis of the item response theory (Rasch model). This has some methodological advantages, such as the fact that the calculated T-scores of the tested children and adolescents are at interval scale level and thus parametric statistical procedures can be applied. This also has great advantages for quantifying changes in repeated measurements. For data analysis it should be noted that IRT terms are used from time to time in the following (e.g., person parameters, threshold parameters), and that there are additional evaluation/presentation options, such as the "T-score maps" presented below.
There are the following two possibilities for the evaluation of the KIDSCREEN questionnaires:
In the following, we therefore provide you with detailed instructions on how to perform the analysis and evaluation as well as useful materials (incl. syntaxes). Regardless of which method you choose, we recommend that you first read through the analysis "by hand".
Please note: The analysis is carried out in the same way for both the self-report and the parent/proxy report.
We ask for your understanding that we cannot perform statistical analyses for you.
Details about the generation of the KIDSCREEN norm data can be found for each of the three questionnaires in the following articles: