title: Comparison of the Multiattribute Utility Instruments EQ-5D and SF-6D in a Europe-Wide Population-Based Cohort of Patients with Inflammatory Bowel Disease 10 Years after Diagnosis.
abstract: Background. The treatment of chronic inflammatory bowel disease (IBD) is costly, and limited resources call for analyses of the cost effectiveness of therapeutic interventions. The present study evaluated the equivalency of the Short Form 6D (SF-6D) and the Euro QoL (EQ-5D), two preference-based HRQoL instruments that are broadly used in cost-effectiveness analyses, in an unselected IBD patient population. Methods. IBD patients from seven European countries were invited to a follow-up visit ten years after their initial diagnosis. Clinical and demographic data were assessed, and the Short Form 36 (SF-36) was employed. Utility scores were obtained by calculating the SF-6D index values from the SF-36 data for comparison with the scores obtained with the EQ-5D questionnaire. Results. The SF-6D and EQ-5D provided good sensitivities for detecting disease activity-dependent utility differences. However, the single-measure intraclass correlation coefficient was 0.58, and the Bland-Altman plot indicated numerous values beyond the limits of agreement. Conclusions. There was poor agreement between the measures retrieved from the EQ-5D and the SF-6D utility instruments. Although both instruments may provide good sensitivity for the detection of disease activity-dependent utility differences, the instruments cannot be used interchangeably. Cost-utility analyses performed with only one utility instrument must be interpreted with caution.
authors.affiliation: Department of Gastroenterology, Telemark Hospital, 3710 Skien, Norway.
authors.forename: Gert
authors.identifier: 0000-0002-5693-8773
authors.initials: G
authors.lastname: Huppertz-Hauss
authors.affiliation: Department of Health Management and Health Economics, Institute of Health and Society, University of Oslo, 0310 Oslo, Norway; Health Services Research Unit, Akershus University Hospital, Lørenskog, Norway.
authors.forename: Eline
authors.initials: E
authors.lastname: Aas
authors.affiliation: Department of Gastroenterology, Oslo University Hospital, Ullevål, 0424 Oslo, Norway.
authors.forename: Marte
authors.identifier: 0000-0002-0104-465X
authors.initials: M
authors.lastname: Lie Høivik
authors.affiliation: Department of Medicine, Gentofte Hospital, 2900 Hellerup, Denmark.
authors.forename: Ebbe
authors.identifier: 0000-0002-8558-8442
authors.initials: E
authors.lastname: Langholz
authors.affiliation: Ben-Gurion University of the Negev, 84105 Beersheba, Israel.
authors.forename: Selwyn
authors.initials: S
authors.lastname: Odes
authors.affiliation: Department of Biostatistics, Oslo University Hospital, 0424 Oslo, Norway.
authors.forename: Milada
authors.initials: M
authors.lastname: Småstuen
authors.affiliation: Department of Internal Medicine, University Hospital of Ferrara, 44124 Ferrara, Italy.
authors.forename: Reinhold
authors.initials: R
authors.lastname: Stockbrugger
authors.affiliation: Department of Research and Development, Telemark Hospital, 3710 Skien, Norway.
authors.forename: Geir
authors.initials: G
authors.lastname: Hoff
authors.affiliation: Department of Gastroenterology, Oslo University Hospital, Ullevål, 0424 Oslo, Norway.
authors.forename: Bjørn
authors.initials: B
authors.lastname: Moum
authors.affiliation: Department of Research and Development, Telemark Hospital, 3710 Skien, Norway.
authors.forename: Tomm
authors.initials: T
authors.lastname: Bernklev