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01.12.2012 | Short report | Ausgabe 1/2012 Open Access

Health and Quality of Life Outcomes 1/2012

Item and response-category functioning of the Persian version of the KIDSCREEN-27: Rasch partial credit model

Health and Quality of Life Outcomes > Ausgabe 1/2012
Peyman Jafari, Zahra Bagheri, Mozhgan Safe
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1477-7525-10-127) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors’ contribution

PJ researched and analyzed the data, and wrote the manuscript, ZB analyzed the data and wrote the manuscript, MS researched and analyzed the data. All authors read and approved the final manuscript.



The purpose of the study was to determine whether the Persian version of the KIDSCREEN-27 has the optimal number of response category to measure health-related quality of life (HRQoL) in children and adolescents. Moreover, we aimed to determine if all the items contributed adequately to their own domain.


The Persian version of the KIDSCREEN-27 was completed by 1083 school children and 1070 of their parents. The Rasch partial credit model (PCM) was used to investigate item statistics and ordering of response categories. The PCM showed that no item was misfitting. The PCM also revealed that, successive response categories for all items were located in the expected order except for category 1 in self- and proxy-reports.


Although Rasch analysis confirms that all the items belong to their own underlying construct, response categories should be reorganized and evaluated in further studies, especially in children with chronic conditions.
Authors’ original file for figure 1
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