Validation of a Spanish version of the Revised Fibromyalgia Impact Questionnaire (FIQR)

Abstract

Background: The Revised version of the Fibromyalgia Impact Questionnaire (FIQR) was published in 2009. The aimof this study was to prepare a Spanish version, and to assess its psychometric properties in a sample of patientswith fibromyalgia. Methods: The FIQR was translated into Spanish and administered, along with the FIQ, the Hospital AnxietyDepression Scale (HADS), the 36-Item Short-Form Health Survey (SF-36), and the Brief Pain Inventory (BPI), to 113 Spanish fibromyalgia patients. The administration of the Spanish FIQR was repeated a week later. Results: The Spanish FIQR had high internal consistency (Cronbach's a was 0.91 and 0.95 at visits 1 and 2respectively). The test-retest reliability was good for the FIQR total score and its function and symptoms domains(intraclass correlation coefficient (ICC > 0.70), but modest for the overall impact domain (ICC = 0.51). Statisticallysignificant correlations (p < 0.05) were also found between the FIQR and the FIQ scores, as well as between theFIQR scores and the remaining scales' scores. Conclusions: The Spanish version of the FIQR has a good internal consistency and our findings support its validityfor assessing fibromyalgia patients. It might be a valid instrument to apply in clinical and investigational grounds. © 2013 Salgueiro et al.; licensee BioMed Central Ltd.