Mapping the SF-12 to preference-based instruments: convergent validity in a low-income, minority population.

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.

journal_name

Med Care

journal_title

Medical care

authors

Franks P,Lubetkin EI,Gold MR,Tancredi DJ

doi

10.1097/01.MLR.0000093480.58308.D8

keywords:

subject

Has Abstract

pub_date

2003-11-01 00:00:00

pages

1277-83

issue

11

eissn

0025-7079

issn

1537-1948

journal_volume

41

pub_type

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