Translation and Validation of the Greek Version of the Revised Fibromyalgia Impact Questionnaire (FIQR)
Arriana Gkouvi1, Eleni C Pardali1, Katerina Maria Kontouli2,3
1Immunonutrition Unit, Department of Rheumatology and Clinical Immunology, Faculty of Medicine, School of Health Sciences, University of Thessaly, Biopolis, Larissa, Greece.
Objective:
Increasing awareness of chronic pain conditions, such as fibromyalgia, requires validated tools to monitor the impact of the disease and response to treatment. This study aimed to translate and validate the Revised Fibromyalgia Impact Questionnaire (FIQR) in Greek patients with fibromyalgia.
Methods:
The FIQR was translated into Greek (FIQR-GR) using the forward-backward-forward method. A total of 311 adults participated in this validation study by completing questionnaires and reporting their demographic characteristics (age, gender, weight, height, education, profession, and number of children). Internal consistency was evaluated using Cronbach's alpha, and confirmatory factor analysis (CFA) was conducted to assess the structural validity of the tool. Regression models were used to test the association between FIQR and demographic characteristics.
Results:
The FIQR-GR demonstrated excellent internal consistency (Cronbach's alpha=0.94, function domain 0.92, Overall Impact domain 0.85, symptoms domain 0.85). CFA revealed goodness of fit (CFI=0.900, RMSEA=0.080, SRMR=0.056) and confirmed the original three-factor model. Most items had high standardised factor loadings (0.51 to 0.86), providing strong evidence for validity, although two items had lower values than expected (0.40 for energy levels, 0.48 for depression). There was a significant positive association between FIQR and body mass index (BMI) (p<0.001), suggesting that patients with a higher BMI experienced more severe fibromyalgia symptoms.
Conclusion:
The FIQR-GR is a valid and reliable tool for Greek patients with fibromyalgia and a valuable tool in clinical and research settings.
