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01-04-2013 | Uitgave 3/2013

Quality of Life Research 3/2013

Assessment of response shift using two structural equation modeling techniques

Tijdschrift:
Quality of Life Research > Uitgave 3/2013
Auteurs:
Pranav K. Gandhi, L. Douglas Ried, I-Chan Huang, Carole L. Kimberlin, Teresa L. Kauf
Belangrijke opmerkingen
An erratum to this article can be found at http://​dx.​doi.​org/​10.​1007/​s11136-012-0244-1.

Abstract

Objective

To identify response shift using two structural equation modeling (SEM) techniques.

Study design and setting

Hypertensive patients (n = 909) with coronary artery disease (CAD) completed SF-36 surveys at both baseline and 1-year follow-up. Response shift was identified using Oort and Schmitt SEM techniques. The type of response shift linked to changes in various parameters of the SEM measurement model is defined differently for both SEM approaches. Effect sizes were calculated for the impact of response shift on the change of SF-36 domain scores when using the Oort approach.

Results

Both Oort and Schmitt SEM approaches identified response shift only in the SF-36 physical functioning (PF) scale. The effect size of recalibration on the change of PF domain scores when using the Oort approach was −0.12.

Conclusion

This study showed that hypertensive patients with CAD experienced a response shift over a 1-year period. Both the SEM approaches identified response shift (uniform recalibration using the Oort approach and recalibration using the Schmitt approach); however, both approaches use different parameters to define and test response shift. We found that either the variation in analytic methods or the sample used may influence the identification and type of response shift.

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