Article2003

Mapping the SF-12 to Preference-Based Instruments

Peter John Franks · Erica Ilene Lubetkin · Marthe R. Gold · Daniel Joseph Tancredi

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Health Systems, Economic Evaluations, Quality of Life Economic and Environmental Valuation Chronic Disease Management Strategies

Abstract

BACKGROUND: The profile-based SF-12 has a low respondent burden and is used widely in clinical settings to monitor health and evaluate programs. Deriving preference scores for the SF-12 health profile would permit its use in cost-effectiveness analyses. Previous mapping studies of SF family instruments to preference-based instruments have not examined convergent validity or performance in low-income, minority populations. OBJECTIVES: To map the SF-12 to the EuroQol (EQ-5D Index) and the Health Utilities Index Mark 3 (HUI3) in a low-income, predominantly minority sample. RESEARCH DESIGN: We used a cross-sectional survey data. SUBJECTS: We studied a convenience sample of 240 low-income, predominantly Latino and black patients attending a community health center in New York. MEASURES: We used separate regressions of the EQ-5D Index and HUI3 onto the physical (PCS-12) and mental (MCS-12) components of the SF-12 scores as measures. RESULTS: For the EQ-5D Index regression, the adjusted variance explained was 58% (bootstrap validation 95% confidence interval [CI], 46-66). For the HUI3 regression, the adjusted variance explained was 51% (bootstrap 95% CI, 39-59). The correlation coefficient between the 2 predicted measures was 0.96. The correlation of the predicted HUI3 with the EQ-5D Index (0.73) and the predicted EQ-5D Index with the HUI3 (0.70) exceeded that between the 2 original preference-based measures themselves (0.69). CONCLUSIONS: These pilot results suggest that the SF-12 could be successfully mapped to both the EQ-5D Index and HUI3, yielding preference-based scores that demonstrate convergent validity in a low-income, minority sample.

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References

1996A 12-Item Short-Form Health Survey 1997Modeling Valuations for EuroQol Health States 2002The estimation of a preference-based measure of health from the SF-36 1998Cross-Validation of Item Selection and Scoring for the SF-12 Health Survey in Nine Countries 2002Multiattribute and Single-Attribute Utility Functions for the Health Utilities Index Mark 3 System 1997Measuring health-related quality of life in rheumatoid arthritis: validity, responsiveness and reliability of EuroQol (EQ-5D)1993Testing the validity of the Euroqol and comparing it with the SF-36 health survey questionnaire 2000Comparison of the EQ-5D and SF-12 Health Surveys in a General Population Survey in Alberta, Canada

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