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Quality of Life Research
Published in: Quality of Life Research 10/2021

Open Access 01-10-2021 | Review

Minimal important change (MIC): a conceptual clarification and systematic review of MIC estimates of PROMIS measures

Authors: Caroline B. Terwee, John Devin Peipert, Robert Chapman, Jin-Shei Lai, Berend Terluin, David Cella, Pip Griffiths, Lidwine B. Mokkink

Published in: Quality of Life Research | Issue 10/2021

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Abstract

We define the minimal important change (MIC) as a threshold for a minimal within-person change over time above which patients perceive themselves importantly changed. There is a lot of confusion about the concept of MIC, particularly about the concepts of minimal important change and minimal detectable change, which questions the validity of published MIC values. The aims of this study were: (1) to clarify the concept of MIC and how to use it; (2) to provide practical guidance for estimating methodologically sound MIC values; and (3) to improve the applicability of PROMIS by summarizing the available evidence on plausible PROMIS MIC values. We discuss the concept of MIC and how to use it and provide practical guidance for estimating MIC values. In addition, we performed a systematic review in PubMed on MIC values of any PROMIS measure from studies using recommended approaches. A total of 50 studies estimated the MIC of a PROMIS measure, of which 19 studies used less appropriate methods. MIC values of the remaining 31 studies ranged from 0.1 to 12.7 T-score points. We recommend to use the predictive modeling method, possibly supplemented with the vignette-based method, in future MIC studies. We consider a MIC value of 2–6 T-score points for PROMIS measures reasonable to assume at this point. For surgical interventions a higher MIC value might be appropriate. We recommend more high-quality studies estimating MIC values for PROMIS.
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Metadata
Title
Minimal important change (MIC): a conceptual clarification and systematic review of MIC estimates of PROMIS measures
Authors
Caroline B. Terwee
John Devin Peipert
Robert Chapman
Jin-Shei Lai
Berend Terluin
David Cella
Pip Griffiths
Lidwine B. Mokkink
Publication date
01-10-2021
Publisher
Springer International Publishing
Published in
Quality of Life Research / Issue 10/2021
Print ISSN: 0962-9343
Electronic ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-021-02925-y

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