title: Assessment of the Swedish EQ-5D experience-based value sets in a total hip replacement population.
abstract: BACKGROUND
  All patients undergoing elective total hip replacement (THR) in Sweden are asked to complete a survey, including the EQ-5D. Thus far, EQ-5D values have been presented using the UK TTO value set based on hypothetical values. Shift to the use of the recently introduced Swedish experience-based value set, derived from a representative Swedish population, is an appealing alternative.
  
  
  OBJECTIVE
  To investigate how accurate the Swedish experience-based VAS value set predicts observed EQ VAS values and to compare correlations between Swedish and UK value sets including two provisional value sets derived from the THR population.
  
  
  METHODS
  Pre- and one-year postoperative data from 56,062 THR patients from the Swedish Hip Arthroplasty Register were used. Agreement between the observed and the predicted EQ VAS values was assessed with correlation. Based on pre- and postoperative data, we constructed two provisional VAS value sets.
  
  
  RESULTS
  Correlations between observed and calculated values using the Swedish VAS value set were moderate (r = 0.46) in preoperative data and high (r = 0.72) in postoperative data. Correlations between UK and register-based value sets were constantly lower compared to Swedish value sets. Register-based values and Swedish values were highly correlated.
  
  
  CONCLUSIONS
  The Swedish value sets are more accurate in terms of representation of the Swedish THR patients than the currently used UK TTO value set. We find it feasible to use the experience-based Swedish value sets for further presentation of EQ-5D values in the Swedish THR population.
authors.affiliation: Swedish Hip Arthroplasty Register, Gothenburg, Sweden. szilard.nemes@registercentrum.se.|Department of Orthopaedics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden. szilard.nemes@registercentrum.se.
authors.forename: Szilárd
authors.identifier: http://orcid.org/0000-0002-4145-1786
authors.initials: S
authors.lastname: Nemes
authors.affiliation: Medical Management Centre, Department of Learning, Informatics, Management and Ethics, Karolinska Institutet, Stockholm, Sweden.|Equity and Health Policy Research Group, Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden.|Stockholm County Council, Health Care Services, Stockholm, Sweden.
authors.forename: Kristina
authors.initials: K
authors.lastname: Burström
authors.affiliation: Medical Management Centre, Department of Learning, Informatics, Management and Ethics, Karolinska Institutet, Stockholm, Sweden.|The Dental and Pharmaceutical Benefits Agency, Stockholm, Sweden.
authors.forename: Niklas
authors.initials: N
authors.lastname: Zethraeus
authors.affiliation: Swedish Hip Arthroplasty Register, Gothenburg, Sweden.|Department of Orthopaedics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
authors.forename: Ted
authors.initials: T
authors.lastname: Eneqvist
authors.affiliation: Swedish Hip Arthroplasty Register, Gothenburg, Sweden.|Department of Orthopaedics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
authors.forename: Göran
authors.initials: G
authors.lastname: Garellick
authors.affiliation: Swedish Hip Arthroplasty Register, Gothenburg, Sweden.|Department of Orthopaedics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.|Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, MA, USA.
authors.forename: Ola
authors.initials: O
authors.lastname: Rolfson
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D011788:Quality of Life / Q000523:psychology*; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires; D013548:Sweden; D055815:Young Adult
keywords: EQ-5D; Experience-based value sets; Quality register; Swedish Hip Arthroplasty Register; Time trade-off; Total hip replacement; Visual analogue scale