title: [Evaluation of patients with fibromyalgia. Comparative study of 4 Spanish versions of the Fibromyalgia Impact Questionnaire (FIQ)].
abstract: OBJECTIVE
  To describe and compare the process of transcultural adaptation in the 4 validated Spanish versions of the Fibromyalgia Impact Questionnaire (FIQ).
  
  
  METHODS
  a) Questionnaires. The first version (FIQ1) appeared as a doctoral thesis in 1988; the second (FIQ2) was published in a Spanish psychology journal; the third (FIQ3) was published in an English language journal; and the last (FIQ4) appeared in November 2004 in the Revista Española de Reumatología. b) Methods In each of the versions the following were assessed: 1) the semantic equivalence with respect to the original FIQ, 2) each version's degree of development following a standardized method based on the GRAQoL Index (GI), and 3) the impact of publication.
  
  
  RESULTS
  The FIQ4 showed a greater semantic equivalency. The degree of development shown by the GI produced the following results: FIQ1, 56%; FIQ2, 50%; FIQ3, 75%; FIQ4, 31%. Only the FIQ3 results were published in Medline-indexed journals.
  
  
  CONCLUSIONS
  The Spanish FIQ3 version presents a greater degree of development and an acceptable semantic equivalency with respect to the original, and has achieved a greater impact.
authors.affiliation: Sección de Reumatología. Hospital General Universitario de Alicante. Alicante. España.
authors.forename: Joaquim Jordi
authors.initials: JJ
authors.lastname: Esteve Vives
authors.forename: Enrique
authors.initials: E
authors.lastname: Batlle Gualda