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Abstract
Objective
To extend the anchor-based minimal important differences (MIDs) credibility instrument
by adding an item addressing construct proximity as the alternative to the correlation
item.
Study design and Setting
The credibility instrument includes one core items addressing the correlation between
the patient-reported outcome measure (PROM) and the anchor. However, the majority
of MID studies in the literature fail to report the correlation. As an alternative
item, we added a subjective assessment of similarity of the constructs (i.e., construct
proximity) between the PROM and anchor and generated principles for the assessment.
We sampled 101 MIDs and analyzed the assessments performed by each pair of raters.
By calculating weighted Cohen’s kappa, we assessed the reliability of the assessments.
Results
Construct proximity assessment is based on the anticipated association between the
anchor and PROM constructs: the closer the anticipated association, the higher the
rating. Our detailed principles address the most frequently used anchors: transition
ratings, measures of satisfaction, other PROMs, and clinical measures. The assessments
showed acceptable agreement (weighted kappa 0.74, 95% CI 0.55 to 0.94) between raters.
Conclusion
In the absence of a reported correlation coefficient, construct proximity assessment
provides a useful alternative in the credibility assessment of anchor-based MID estimates.
Keywords
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Article info
Publication history
Accepted:
March 1,
2023
Received in revised form:
February 15,
2023
Received:
May 10,
2022
Publication stage
In Press Journal Pre-ProofIdentification
Copyright
© 2023 Elsevier Inc. All rights reserved.
