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Minimal important differences for fatigue patient reported outcome measures-a systematic review
Åsa Nordin1,2, Charles Taft1,3, Åsa Lundgren-Nilsson1,2
1Gothenburg Centre for Person-Centred Care (GPCC), Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
BMC Medical Research Methodology
|July 9, 2016
Summary
Minimal important difference (MID) values for fatigue patient-reported outcome measures (PROMs) vary widely. Understanding how these MIDs are derived is crucial for their appropriate use in clinical research and practice.
Area of Science:
- Medical research
- Clinical trials
- Patient-reported outcomes
Background:
- Fatigue is a prevalent symptom in chronic illnesses, frequently assessed using patient-reported outcome measures (PROMs).
- Over 40 generic and disease-specific PROMs exist for fatigue assessment.
- Minimal important difference (MID) estimates enhance the interpretation of PROM score changes.
Purpose of the Study:
- To compile published MIDs for fatigue PROMs across diverse patient groups and estimation methods.
- To provide guidance for evaluating the appropriateness of MIDs in clinical trials and routine practice.
Main Methods:
- Systematic literature search of Scopus, CINAHL, and Cochrane databases (2000-2015).
- Data extraction on MIDs, anchor types, and study designs by two independent authors.
- Compilation of MID data for fatigue scales, subscales, and single items.
Main Results:
- 41 studies reported 60 MID estimates for 28 fatigue measures.
- All studies used anchor-based methods; some also used distribution-based methods or triangulation.
- Significant variability observed in MID magnitudes across different measures and studies.
Conclusions:
- Published MIDs for fatigue PROMs demonstrate considerable variation.
- Detailed information on the derivation of fatigue MIDs is essential for assessing their clinical applicability and research suitability.
