Inconsistencies in TTO and VAS Values for EQ-5D Health States

Medical Decision Making - Tập 26 Số 2 - Trang 173-181 - 2006
Leida M. Lamers1, Peep F. M. Stalmeier2, Paul F. M. Krabbe3, Jan J.V. Busschbach4
1Institute for Medical Technology Assessment (iMTA), Erasmus MC, PO Box 1738, 3000 DR Rotterdam, the Netherlands.
2Department of Radiation Oncology; Department of Medical Technology Assessment, Radboud University Nijmegen Medical Centre, the Netherlands
3Department of Medical Technology Assessment, Radboud University Nijmegen Medical Centre, The Netherlands
4Viersprong Institute for Studies on Personality Disorders, Halsteren, The Netherlands

Tóm tắt

Background. Most EQ-5D health states can be ordered logically. When people assign values to different health states, they may violate this logical order, which can be seen as inconsistencies. Objective. The aim of this study was to assess the effect of inconsistently valued EQ-5D health states on mean visual analog scale (VAS) and time trade-off (TTO) values. The authors also examined the effect of removing respondents with high numbers of inconsistent states on the estimation of tariffs, which is used to interpolate values to all possible EQ-5D states from the direct valuation of a subset of states. Method. Data from the Dutch EQ-5D valuation study were used. A representative sample of 309 Dutch adults valued 17 EQ-5D health states by VAS and TTO. A state was valued inconsistently when it had a higher value than at least 1 logically better state. Mean values of groups with various numbers of inconsistently valued states were compared. Results. Of the respondents, 65% had inconsistencies for VAS and 89% for TTO. The mean VAS values of consistent respondents tend to be lower. For TTO, those with inconsistencies gave lower values. Removing data of respondents with the highest number of inconsistently valued states for VAS (13%) and TTO (9%) did not result in statistically significant different coefficients in the estimated tariff using all data. Conclusion. The majority of respondents valued at least 1 state inconsistently. For both VAS and TTO, the presence of these inconsistencies did not affect the estimated tariffs

Từ khóa


Tài liệu tham khảo

10.1016/0168-8510(96)00822-6

Drummond MF, 1997, Methods for the Economic Evaluation of Health Care Programmes

10.1002/(SICI)1099-1050(199603)5:2<141::AID-HEC189>3.0.CO;2-N

10.1097/00005650-199711000-00002

10.1177/0272989X0102100102

10.1002/hec.673

10.1097/00005650-200503000-00003

10.1016/S0277-9536(99)00182-3

10.1016/0277-9536(95)00161-1

Ohinmaa A, 1999, EuroQol Plenary Meeting, 1-2 October 1998. Discussion papers. Centre for Health Economics and Health Systems Research, 57

10.1002/hec.741

10.1177/0272989X0202200413

Lamers LM, The Dutch tariff: results and arguments for a costeffective design of national EQ-5D valuation studies

Gudex C, 1994, Time Trade-Off User Manual: Props and Self-Completion Methods

MVH Group, 1994, The Measurement and Valuation of Health: First Report on the Main Survey

10.1097/00005650-199607000-00004

10.1007/978-94-017-0233-1_8

10.1016/S1574-0064(00)80045-1

Thông tin
Thông tin xuất bản

Medical Decision Making

Tập 26 Số 2

173-181

Thông tin tác giả