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A Descriptive Comparison of Scoring Methods and Criteria for Evaluating Consensus in Modified Delphi Methods
Marlo Salum1, Kara Schick-Makaroff1, Richard Sawatzky1,2,3,4
1Faculty of Nursing, College of Health Sciences, University of Alberta, Edmonton, Alberta, Canada.
Summary
Consensus analysis in modified Delphi studies yields varied results based on how participant groups and Likert scale responses are handled. Careful consideration of analysis methods is crucial for accurate interpretation and application in healthcare pathway development.
Area of Science:
- Healthcare research methodology
- Patient and public involvement in research
Background:
- Modified Delphi methods are common for developing healthcare pathways.
- Input from people with lived experience (PWLE) and clinicians is vital.
- Limited guidance exists for consensus analysis in these studies.
Purpose of the Study:
- To examine consensus outcomes using different scoring methods and criteria.
- To compare results when participants are grouped together versus separately.
- To inform best practices for consensus analysis in modified Delphi studies.
Main Methods:
- Secondary analysis of Round 1 Delphi data (PWLE N=8, clinicians/others N=51).
- Applied three scoring methods for percentage agreement on 68 statements, varying treatment of the 'not sure' response.
- Compared consensus rates using ≥70%, ≥80%, and ≥90% agreement cutoffs.
Main Results:
- Consensus outcomes differed based on participant grouping, scoring method, and cutoff criteria.
- A combined group offered simplified consensus overview.
- Separate groups provided more nuanced findings.
Conclusions:
- Data analysis approaches significantly impact study conclusions and practical implications.
- Investigators must align their chosen analysis method with study objectives.
- Choosing the right method is critical for informing healthcare practice.
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