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Do Portuguese and UK health state values differ across valuation methods?
Lara N Ferreira1, Pedro L Ferreira, Donna Rowen
1School of Management, Hospitality and Tourism, University of the Algarve, Faro, Portugal. Lnferrei@ualg.pt
Summary
Developing country-specific health utility weights is crucial. This study found rank-based preference weights for the SF-6D showed higher similarity across UK and Portuguese populations than standard gamble methods.
Area of Science:
- Health Economics
- Psychometrics
- Quality of Life Research
Background:
- Growing interest in country-specific preference weights for health-related quality of life measures.
- Traditional cardinal methods (standard gamble, time trade-off) are being supplemented by ordinal methods for health state valuation.
Purpose of the Study:
- To compare ordinal (rank) and cardinal (standard gamble) preference elicitation methods for SF-6D health state utility values.
- To assess the robustness of these methods across UK and Portuguese populations.
- To evaluate the impact of different preference weights on health comparisons within the Portuguese working population.
Main Methods:
- Examined standard gamble and rank preference weights for the SF-6D using UK and Portuguese general population samples.
- Estimated Portuguese rank-based preference weights (n=140) with 810 health state valuations.
- Assessed the impact of different weights on SF-6D values and group differences in the Portuguese working population (n=2,459).
Main Results:
- The rank model demonstrated good performance across goodness-of-fit measures.
- Portuguese rank-based preference weights were systematically lower than UK weights for physical functioning and pain.
- Rank-derived preference weights showed greater similarity between UK and Portuguese samples compared to standard gamble weights.
- SF-6D values and group differences in the Portuguese working population were influenced by the choice of preference weights.
Conclusions:
- Ordinal methods, specifically rank-based elicitation, show promise for cross-population comparisons.
- A Portuguese SF-6D weighting system is recommended for studies focused on the Portuguese population's health state preferences.
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