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KMID : 0928320070070020096
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Korean Journal of Health Promotion and Disease Prevention
2007 Volume.7 No. 2 p.96 ~ p.103
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Validity and Reliability of Korean EQ-5D Valuation Study Using the Time-trade off Method
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Jo Min-Woo
Lee Sang-Il
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Abstract
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Background : There has been no study for testing the applicability of time trade-off method to general population in South Korea. This study aimed to examine the validity and reliability in obtaining EQ-5D value set with the time trade-off (TTO) method in general population of South Korea.
Methods : For the initial survey, 500 persons were recruited from general population in Seoul and Gyeonggi province. Ninety-seven among them took part in the second survey. Direct valuation was elicited for 43 health states (42 EQ-5D health states and ’unconscious’ state) in face-to-face interviews using the visual analog scale (VAS) and TTO method. Validity was assessed with the number of inconsistent responses and the relationship between VAS and TTO scores. Intra-class correlation coefficient (ICC) was calculated to evaluate the test-retest reliability.
Results : Pearson’s correlation coefficient between VAS and TTO values was 0.934 (p<0.001). The relational formula was TTO=1-(1-VAS)1.028 and R2 was 0.973. The mean ICC was 0.857 (95% confidence interval: 0.836 - 0.878). Twelve persons (2.4%) had 4 or more inconsistent responses.
Conclusions : We confirmed that TTO method can be used as a valid and reliable tool for valuing EQ-5D health states in general population of South Korea. (Korean J Health Promot Dis Prev 2007 ; 7(2):96~103)
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KEYWORD
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EQ-5D, Time trade-off, validity, reliability
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