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Evaluation of Split Version and Feedback Module on the Improvement of Time Trade-Off Data
Eliza L Y Wong1, Koonal Shah2, Annie W L Cheung1
1The Jockey Club School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China.
Summary
Implementing a feedback (FB) module significantly improved the consistency of time trade-off (TTO) data in EQ-5D-5L valuation studies. Separating valuation tasks for Better than Dead (BTD) and Worse than Dead (WTD) states did not consistently enhance data reliability.
Area of Science:
- Health Economics
- Psychometrics
- Survey Methodology
Background:
- Time trade-off (TTO) data in EQ-5D-5L valuation studies often exhibit inconsistencies.
- Potential causes include ordering effects, sorting question errors, and interviewer learning effects.
Purpose of the Study:
- To evaluate the impact of two modifications on TTO data consistency: separating Better than Dead (BTD) and Worse than Dead (WTD) state valuations and implementing a feedback (FB) module.
- To assess these modifications in The Netherlands (NL) and Hong Kong (HK).
Main Methods:
- A crossover design with two study arms was employed.
- Interviewer versions (standard vs. split valuation) were alternated.
- Data were collected from 404 respondents in NL and 403 in HK.
Main Results:
- The FB module reduced inconsistent responses from 17.8% to 10.6% in NL (P < 0.001) and 31.8% to 22.3% in HK (P = 0.003).
- Separating BTD and WTD valuations inconsistently affected data consistency across jurisdictions.
Conclusions:
- The FB module is recommended for enhancing the consistency of TTO valuation data.
- Separating BTD and WTD valuation tasks is not supported by this study's findings.
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