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Scope insensitivity in contingent valuation studies of health care services: should we ask twice?
MedLine Citation:
PMID:  21108296     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The main purpose of the present study was to test for outcome scope insensitivity. Respondents were initially asked to value one of two severe health states by way of a time-trade-off (TTO) exercise. Subsequent to the TTO exercise all respondents were asked to value an intervention, which offered a reduction in risk of falling into the health state they had evaluated. All respondents were subsequent to this initial CV exercise asked to value the same risk reduction, but in this case the outcome was death. Although our study passes the internal scope test, there is not a high degree of sensitivity to outcome. As many as 68% of respondents stated an identical maximum WTP in first and second CV valuation exercise implying that they value the interventions equally despite the fact that the health state presented in the initial CV question was deemed far better than death according to the TTO responses given by the same respondents. In contrast, the external scope test (comparison of response to initial CV across study arms) fared much better. Copyright © 2010 John Wiley & Sons, Ltd.
Authors:
D Gyrd-Hansen; T Kjær; J S Nielsen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-11-24
Journal Detail:
Title:  Health economics     Volume:  -     ISSN:  1099-1050     ISO Abbreviation:  Health Econ     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9306780     Medline TA:  Health Econ     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Institute of Public Health, Unit for Health Economics, University of Southern Denmark, Odense, Denmark.
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