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Published in: Quality of Life Research 6/2016

Open Access 01-06-2016 | Special Section: Response Shift Effects at Item Level (by invitation only)

Using a retrospective pretest instead of a conventional pretest is replacing biases: a qualitative study of cognitive processes underlying responses to thentest items

Authors: Elsbeth F. Taminiau-Bloem, Carolyn E. Schwartz, Florence J. van Zuuren, Margot A. Koeneman, Mechteld R. M. Visser, Carol Tishelman, Caro C. E. Koning, Mirjam A. G. Sprangers

Published in: Quality of Life Research | Issue 6/2016

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Abstract

Background

The thentest design aims to detect and control for recalibration response shift. This design assumes (1) more consistency in the content of the cognitive processes underlying patients’ quality of life (QoL) between posttest and thentest assessments than between posttest and pretest assessments; and (2) consistency in the time frame and description of functioning referenced at pretest and thentest. Our objective is to utilize cognitive interviewing to qualitatively examine both assumptions.

Methods

We conducted think-aloud interviews with 24 patients with cancer prior to and after radiotherapy to elicit cognitive processes underlying their assessment of seven EORTC QLQ-C30 items at pretest, posttest and thentest. We used an analytic scheme based on the cognitive process models of Tourangeau et al. and Rapkin and Schwartz that yielded five cognitive processes. We subsequently used this input for quantitative analysis of count data.

Results

Contrary to expectation, the number of dissimilar cognitive processes between posttest and thentest was generally larger than between pretest and posttest across patients. Further, patients considered a range of time frames when answering the thentest questions. Moreover, patients’ description at the thentest of their pretest functioning was often not similar to that which was noted at pretest. Items referring to trouble taking a short walk, overall health and QoL were most often violating the assumptions.

Conclusions

Both assumptions underlying the thentest design appear not to be supported by the patients’ cognitive processes. Replacing the conventional pretest–posttest design with the thentest design may simply be replacing one set of biases with another.
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Metadata
Title
Using a retrospective pretest instead of a conventional pretest is replacing biases: a qualitative study of cognitive processes underlying responses to thentest items
Authors
Elsbeth F. Taminiau-Bloem
Carolyn E. Schwartz
Florence J. van Zuuren
Margot A. Koeneman
Mechteld R. M. Visser
Carol Tishelman
Caro C. E. Koning
Mirjam A. G. Sprangers
Publication date
01-06-2016
Publisher
Springer International Publishing
Published in
Quality of Life Research / Issue 6/2016
Print ISSN: 0962-9343
Electronic ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-015-1175-4

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