Aims and
Objectives: To scrutinize the evidence of response shift effect on published
quality of life (QOL) studies investigating the patient-reported outcome to
obtain accuracy data as evaluating clinical practice. Background: People may
alter their internal standards, known as response shift, when they experience
changes in their health status. This phenomenon can falsify patient-re- ported
measures, and has gained increasing attention recently in explaining research
paradoxical findings. Nevertheless a rigorous evidence-base about this effect
on cancer patients QOL is lacking. Design: A systematic review was carried out
under adhered to the guideline of the Quality of Reporting of Meta-Analyses. Methods:
A comprehensive search was conducted on seven English and Chinese databases to
identify and collect studies focus on cancer patients QOL. Methodological
quality assessment was performed to assess the strength of evidence. Results:
Using pre-deter- mined keywords, 584 relevant titles were identified.
Eventually 14 papers satisfied the inclusion criteria and entered the quality
assessment stage. All the articles were written in English and published
between 1996 and 2013.A majority of
the studies used the then-test method, which is also known as the retrospective
pretest-posttest design method. The weighted
mean effect size (WMES) was 0.47 (95% CI 0.31 to 0.63). Using data from
the six studies for assessing then-test/pre-test comparison on the outcome
measure fatigue, the WMES was ﹣0.21 (95% CI ﹣0.32 to ﹣0.10). Conclusion: The alternation of
self-internal standard occurs when cancer patients evaluated their QOL over a
period of time. Relevance to clinical practice: This review emphasizes the need
for a more sensitive approach to inspect the clinical impact of response shift
by measuring changes in QOL. Patients’ adaptation to the disease can then be
more precisely acquired.
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