Validity of the SF-6D index in Brazilian patients with rheumatoid arthritis

Clin Exp Rheumatol. 2009 Mar-Apr;27(2):237-45.


Objective: To evaluate the construct validity of the SF-6D among a sample of Brazilian patients with rheumatoid arthritis.

Methods: This was a validation and cross-cultural adaptation study. Preference evaluation instruments were applied: SF-6D, EQ-5D, VAS, TTO and SG. Clinical and sociodemographic parameters were obtained. Descriptive statistics, correlation coefficients and ANOVA were used to analyze the results.

Results: 200 patients were evaluated, among whom the non-completion rates were 0.5% for VAS, 1.5% for TTO and 6.5% for SG. The preferences derived from the SF-6D presented the strongest correlations with EQ-5D and HAQ, followed by VAS, TTO and SG, in decreasing order. The correlations with clinical and sociodemographic parameters were, in most cases, small. The preferences obtained with the SF-6D could discriminate patients with different HAQ levels.

Conclusion: The SF-6D is a valid method for measuring preferences in patients with rheumatoid arthritis in a Brazilian context.

Publication types

  • Validation Study

MeSH terms

  • Adult
  • Aged
  • Arthritis, Rheumatoid / diagnosis*
  • Arthritis, Rheumatoid / psychology
  • Brazil
  • Cross-Cultural Comparison
  • Cultural Competency
  • Disability Evaluation*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Patient Satisfaction
  • Quality of Life*
  • Quality-Adjusted Life Years
  • Young Adult