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Delphi procedure in core outcome set development: rating scale and consensus criteria determined outcome selection
Dorien De Meyer1, Jan Kottner2, Hilde Beele3
1Department of Public Health and Primary Care, Skin Integrity Research Group (SKINT), University Centre for Nursing and Midwifery, Ghent University, Ghent, Belgium.
Journal of Clinical Epidemiology
|March 30, 2019
Summary
Choosing the right rating scale and consensus criteria is crucial for core outcome set development. A nine-point scale may be better for initial consensus, while a three-point scale is suitable for final decisions.
Area of Science:
- Health Research Methodology
- Clinical Trial Design
- Patient-Reported Outcomes
Background:
- Core outcome set development is essential for standardizing outcome measurement in clinical research.
- Delphi studies are commonly used to achieve consensus on core outcomes.
- The choice of rating scales and consensus criteria can impact the selection of outcomes.
Purpose of the Study:
- To compare a three-point versus a nine-point Likert scale for consensus in a Delphi study.
- To evaluate the influence of different consensus criteria on outcome selection in core outcome set development.
Main Methods:
- A randomized controlled trial with 1:1 allocation was used for the first Delphi round.
- Participants rated 58 outcomes using either a three-point or a nine-point Likert scale.
- Consensus criteria included proportions, central tendency, and variance.
Main Results:
- The nine-point scale identified nearly twice as many "critical" outcomes as the three-point scale (24 vs. 13).
- Stricter consensus criteria and combined criteria resulted in fewer "critical" outcomes.
- Fifty-seven participants were involved in rating the outcomes.
Conclusions:
- Rating scale format and consensus criteria significantly influence outcome selection in Delphi studies.
- A nine-point scale may be beneficial for initial consensus building.
- A three-point scale may be more appropriate for finalizing consensus on core outcomes.
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