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KMID : 0928320100100030105
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Korean Journal of Health Promotion and Disease Prevention
2010 Volume.10 No. 3 p.105 ~ p.112
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Validity and Reliability of Korean EQ-5D Valuation Study Using a Computer-assisted Standard Gamble Method
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Jo Min-Woo
Kwon Dong-Seop
Kim Seon-Ha
Kil Seol-Ryoung
Lee Sang-Il
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Abstract
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Background: The Standard Gamble (SG) method is the gold standard for valuing health states as a utility. The objective of this study is to examine the validity and reliability of EQ-5D valuation task using a computer-assisted SG method in the general population of South Korea.
Methods: An internet-based computer program was developed to allow respondents to conveniently conduct a valuation of EQ-5D health states with SG. For the first survey, 29 persons were recruited randomly from the general population in Gyeongju city. Of these, 22 participated in the second survey. Direct valuation was elicited
for 43 health states (42 EQ-5D health states and ‘unconscious’ state) during face-to-face interviews through an internet program with a visual analogue scale (VAS), time trade-off (TTO), and SG method. Validity was assessed using the number of respondents with 4 or more inconsistencies and the relationship between VAS,
TTO, and SG values. Intra-class correlation coefficient (ICC) was calculated to evaluate the test-retest reliability.
Results: Of the 29 respondents in the first survey, 5 had 4 or more inconsistent responses compared with 2 in VAS and 9 in TTO. Pearson’s correlation coefficient of SG-VAS and SG-TTO were 0.867 and 0.894, respectively (P<0.001). The relational formulas were SG=1-(1-VAS)0.962 (R2=0.926) and SG=1-(1-TTO)0.932 (R2=0.868). The medians of individual ICC of VAS, TTO, and SG were 0.919, 0.721, and 0.860, respectively.
Conslusions: We found that the internet-assisted SG method can be used as a valid and reliable tool for valuing EQ-5D health states in the general population of South Korea.
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KEYWORD
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Validity, Reliability, EQ-5D, Standard gamble method
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