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Estimating a Minimal Important Difference for the EQ-5D-5L Utility Index in Dialysis Patients
Amanda N Siriwardana1, Anna T Hoffman2, Rachael L Morton3
1Renal and Metabolic Division, The George Institute for Global Health, Sydney, NSW, Australia; Sydney Medical School, University of Sydney, Sydney, NSW, Australia; Department of Renal Medicine, Royal North Shore Hospital, Sydney, NSW, Australia.
Summary
This study established the minimal important difference (MID) for the EQ-5D-5L utility index in dialysis patients, providing crucial benchmarks for treatment effect evaluation in clinical trials.
Area of Science:
- Nephrology
- Health Economics
- Patient-Reported Outcomes
Background:
- The EQ-5D-5L is a vital tool for assessing health-related quality of life in patients undergoing dialysis.
- Establishing a minimal important difference (MID) for the EQ-5D-5L utility index is critical for interpreting treatment effects in this population.
- Currently, no established MID exists for dialysis patients using the EQ-5D-5L.
Purpose of the Study:
- To estimate the minimal important difference (MID) for the EQ-5D-5L utility index specifically in patients receiving dialysis.
- To provide a quantifiable measure for meaningful treatment effects in dialysis interventions.
- To inform the design and interpretation of clinical trials involving dialysis patients.
Main Methods:
- Collected 6-monthly EQ-5D-5L measurements from adult dialysis patients between April 2017 and November 2020.
- Utilized EQ-Visual Analog Scale (EQ-VAS) and Integrated Palliative care Outcome Scale Renal symptom burden scores as anchors.
- Derived MID estimates using both anchor-based (cross-sectional and longitudinal) and distribution-based methods.
Main Results:
- Included 352 patients with 1127 EQ-5D-5L observations; mean baseline utility index was 0.719.
- Anchor-based MID estimates for improvement and deterioration ranged from 0.046 to 0.079 and -0.111 to -0.048, respectively.
- Combined anchor-based and distribution-based methods yielded MID estimates between 0.034 and 0.134 for the EQ-5D-5L utility index.
Conclusions:
- Anchor-based and distribution-based methods provide a range of MID estimates for the EQ-5D-5L utility index in dialysis patients.
- These established MID estimates are valuable for defining target differences and effect sizes in clinical trial design.
- The findings will enhance the interpretation of treatment effectiveness in interventions for patients on dialysis.
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