title: Responsiveness of EQ-5D and SF-6D in patients with early arthritis: results from the ESPOIR cohort.
abstract: OBJECTIVE
  The revolution of early aggressive treatments for early arthritis (EA) has fuelled the search for better approaches to establishing their cost-utility ratio. The authors aimed to compare the responsiveness of the EQ-5D and the SF-6D in a large prospective cohort of patients with EA.
  
  
  METHODS
  EQ-5D and SF-6D utility measures were assessed in 813 patients with EA over 2 years. Responsiveness was analysed by the standardised response mean (SRM) and effect size between baseline and 6, 12 and 24 months for the entire sample and subgroups by disease evolution (increase or decrease in Disease Activity Score for 28 joints). Bootstrap methods were used to estimate 95% CI.
  
  
  RESULTS
  The EQ-5D provided larger absolute mean change estimates with greater variance than the SF-6D, whatever the direction of change. At 12 months, the SF-6D was more sensitive to change with improved condition than the EQ-5D: SRM 0.83 (0.82 to 0.84) versus 0.57 (0.56 to 0.58). In contrast, the EQ-5D was more sensitive to change with deteriorated condition than the SF-6D: SRM -0.20 (-0.23 to -0.18) versus -0.11 (-0.14 to -0.08). Results were similar for 6 and 24 months.
  
  
  CONCLUSIONS
  The SF-6D was more responsive than the EQ-5D with improved EA condition. Confidence in the relative cost-effectiveness of two treatments would be better with the SF-6D because of its smaller variance. The SF-6D provided more conservative cost-effectiveness ratios than the EQ-5D and may be more appropriate for trials of biological treatments for patients with EA.
authors.affiliation: Correspondence to Cécile Gaujoux-Viala, Université Paris 6 -Pierre & Marie Curie, AP-HP, Groupe hospitalier Pitié-Salpêtrière, Service de Rhumatologie, 83 boulevard de l'Hôpital 75651 Paris cedex 13, France. cecilegaujoux@yahoo.fr
authors.forename: Cécile
authors.initials: C
authors.lastname: Gaujoux-Viala
authors.forename: Anne-Christine
authors.initials: AC
authors.lastname: Rat
authors.forename: Francis
authors.initials: F
authors.lastname: Guillemin
authors.forename: René-Marc
authors.initials: RM
authors.lastname: Flipo
authors.forename: Patrice
authors.initials: P
authors.lastname: Fardellone
authors.forename: Pierre
authors.initials: P
authors.lastname: Bourgeois
authors.forename: Bruno
authors.initials: B
authors.lastname: Fautrel
mesh_terms: D001168:Arthritis / Q000175:diagnosis*; D015331:Cohort Studies; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011594:Psychometrics / Q000379:methods*; D011788:Quality of Life