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SAT0387 Psychometric Characteristics of the Italian Version of the Revised Fibromyalgia Impact Questionnaire Using Classical Test Theory and Rasch Analysis
  1. A. Ciapetti1,
  2. F. Salaffi1,
  3. F. Franchignoni2,
  4. A. Giordano3,
  5. P. Sarzi Puttini4,
  6. M. Ottonello5
  1. 1Rheumatology Department, Università Politecnica delle Marche, Jesi (Ancona)
  2. 2Unit of Occupational Rehabilitation and Ergonomics, Clinica del Lavoro e della Riabilitazione, IRCCS
  3. 3Unit of Bioengineering, Clinica del Lavoro e della Riabilitazione, Salvatore Maugeri Foundation, Veruno (Novara)
  4. 4Unità Operativa di Reumatologia, Ospedale L. Sacco, Milan
  5. 5Department of Physical & Rehabilitation Medicine, Salvatore Maugeri Foundation, Clinica del Lavoro e della Riabilitazione, IRCCS, Nervi (Genoa), Italy

Abstract

Objectives The aim of this study was to perform a psychometric analysis of the Italian Fibromyalgia Impact Questionnaire Revised version (FIQR), using both classical test theory (CTT) and Rasch analysis (RA) in order to better analyze its construct validity and provide a rational basis for a possible improvement of its metric quality.

Methods The study involved 503 patients with fibromyalgia (FM) (423 women and 80 men) with mean age of 51.3 ± 10.1 years (range 19-74) and mean duration of symptoms of 11.1 ± 8.7 years (range 1-30). All patients completed the Italian FIQR during their clinical visit. The translation and cultural adaptation process of the Italian FIQR followed the published guidelines and no local adjustments were made except for a slight adaptation of item 13 related to “energy”.

Results Factor Analysis revealed two salient dimensions: function (items 1-9) and symptoms (items 12-21). RA was thus performed on these two subscales. Rating scale diagnostics suggested collapsing the eleven rating categories of the scale into five. After combining these rating categories, RA showed that most items of each of the two subscales fitted the respective constructs to measure (MnSq 0.7-1.3). The reliability levels of the two subscales were higher than 0.80.

Conclusions This study provides psychometric evidence of the reliability, internal validity andtwo-dimensional structure of the FIQR in a FM population. Our results support the useof two separate subscales for “function” and “symptoms”, and provide a useful starting point for further refinement of the scale.

Disclosure of Interest None Declared

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