National EQ-5D tariffs and quality-adjusted life-year estimation: comparison of UK, US and Danish utilities in south Swedish rheumatoid arthritis patients.

Johan Karlsson, Jan-Åke Nilsson, Martin Neovius, Lars Erik Kristensen, Anders Gülfe, Tore Saxne, Pierre Geborek

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

35 Citeringar (SciVal)

Sammanfattning

OBJECTIVE:
To study how the choice of national EQ-5D tariff may affect utility and incremental quality-adjusted life-year (QALY) estimates.

METHODS:
South Swedish rheumatoid arthritis patients in an observational study, starting and continuing anti-tumour necrosis factor (TNF) monotherapy (n=54) or anti-TNF plus methotrexate (n=215) for 1 year during May 2002 to April 2009, were included. EQ-5D questionnaires were completed at baseline, 3, 6 and 12 months. Utilities and accumulated QALY were compared using the UK, US and Danish EQ-5D tariffs. Utilities for all 243 possible EQ-5D health states were also compared.

RESULTS:
US utilities were generally higher than UK, with Danish falling in between. A substantial 1-year mean utility improvement was seen in both study groups using all tariffs (UK 0.28 vs 0.29; US 0.18 vs 0.19; Danish 0.20 vs 0.22). Adjusting for baseline differences between groups, the incremental QALY gain of combined treatment was 0.09 using the UK tariff, while 0.06 according to both US and Danish tariffs. Inter-tariff disagreement in utility and accumulated QALY varied irregularly across the range of utilities.

CONCLUSIONS:
Applying different national EQ-5D tariffs to the same data may result in substantially different incremental QALY estimates, crucial knowledge when interpreting cost-utility analyses. Studies using different tariffs cannot be directly compared.
Originalspråkengelska
Sidor (från-till)2163-2166
TidskriftAnnals of the Rheumatic Diseases
Volym70
DOI
StatusPublished - 2011

Ämnesklassifikation (UKÄ)

  • Reumatologi och inflammation

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