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Mapping between Visual Analogue Scale and Standard Gamble data; results from the UK Health Utilities Index 2 valuation survey
Author(s) -
Stevens Katherine J.,
McCabe Christopher J.,
Brazier John E.
Publication year - 2006
Publication title -
health economics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.55
H-Index - 109
eISSN - 1099-1050
pISSN - 1057-9230
DOI - 10.1002/hec.1076
Subject(s) - mean squared error , valuation (finance) , statistics , eq 5d , econometrics , health utilities index , multiplicative function , mathematics , index (typography) , visual analogue scale , power function , standard error , economics , actuarial science , medicine , computer science , physical therapy , finance , mathematical analysis , disease , pathology , health related quality of life , world wide web
Abstract We examine the relationship between Visual Analogue Scale (VAS) and Standard Gamble (SG) assumed in the development of the multiplicative multi‐attribute utility functions (M‐MAUFs) for the Health Utilities Index (HUI) Mark 2 and Mark 3, using data from a UK valuation study of the HUI2. A range of functional forms are considered, and are compared on the basis of their explanatory power and predictive ability. A restricted cubic function fits the data better than a power curve with a mean absolute error (MAE) of 0.025 and root mean square error (RMSE) of 0.029 compared to a MAE of 0.135 and RMSE of 0.135 for the power curve. The use of a cubic mapping function instead of a power function leads to different predicted health state values. We question the reliance on the assumption of a power curve relationship between VAS and SG data, in the Health Utilities Index valuation framework. Our results demonstrate that further work is required to examine the appropriateness of the published M‐MAUFs for the Health Utilities Indices. Copyright © 2005 John Wiley & Sons, Ltd.