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International Urology and Nephrology
Published in: International Urology and Nephrology 12/2015

01-12-2015 | Nephrology - Original article

Testing measurement equivalence of the SF-36 questionnaire across patients on hemodialysis and healthy people

Authors: Zahra Bagheri, Peyman Jafari, Marjan Faghih, Elahe Allahyari, Tania Dehesh

Published in: International Urology and Nephrology | Issue 12/2015

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Abstract

Background

Differential item functioning (DIF) occurs when members from different groups respond differently to particular items in a health-related quality of life (HRQoL) questionnaire after controlling for underlying HRQoL construct. This study aimed to assess DIF in the SF-36 questionnaire and its effect on comparing HRQoL scores across patients on HD and healthy people.

Methods

One hundred fifty patients on maintenance hemodialysis (HD) and 642 healthy individuals filled out the Persian version of the SF-36 questionnaire. Multiple-group multiple-indicator multiple-causes (MG-MIMIC) model was used to assess DIF across patients on HD and healthy population.

Results

Sixteen out of 36 (44.4 %) items were flagged with DIF. Six out of 16 items (37.5 %) were flagged with uniform DIF, nine items (56.2 %) with non-uniform DIF, and one item (6.2 %) with both uniform DIF and non-uniform DIF. DIF items were associated with all subscales with the exception of the limitation due to physical problems and bodily pain subscales. The significant lower HRQoL scores of patients on HD in comparison with healthy people in the physical functioning and vitality subscales did not change after removing the items with uniform DIF.

Conclusions

Our findings revealed that patients on HD and healthy people perceived the meaning of the items in SF-36 questionnaire differently. Although the impact of DIF is minimal, the cross-group comparison across patients on HD and healthy people should be performed with caution.
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Metadata
Title
Testing measurement equivalence of the SF-36 questionnaire across patients on hemodialysis and healthy people
Authors
Zahra Bagheri
Peyman Jafari
Marjan Faghih
Elahe Allahyari
Tania Dehesh
Publication date
01-12-2015
Publisher
Springer Netherlands
Published in
International Urology and Nephrology / Issue 12/2015
Print ISSN: 0301-1623
Electronic ISSN: 1573-2584
DOI
https://doi.org/10.1007/s11255-015-1092-z

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