RELIABILITY, VALIDITY AND AGREEMENT OF THE THAI SELF-REPORTED FIBROMYALGIA SURVEY QUESTIONNAIRE AMONG PATIENTS WITH CHRONIC MUSCULOSKELETAL PAIN
Background: Fibromyalgia (FM) diagnosis is typically based on the American College of Rheumatology (ACR) criteria, relying on patient-reported symptoms. The Thai self-reported Fibromyalgia Survey Questionnaire (FSQ) was developed based on the 2016 version of the ACR criteria set.
Objectives: This study aimed to evaluate the internal consistency, convergent validity and agreement of the self-reported FSQ compared with the telephone interview of a physician among patients with chronic musculoskeletal pain.
Methods: The Thai FSQ consisting of 25 questions: 19 for widespread pain index (WPI) and 6 for symptom severity scale (SSS), was developed by three Thai physiatrists. The fibromyalgia severity (FS) scale (the sum of WPI and SSS: 0-31) of 13 or more was used to diagnose fibromyalgia. All participants completed a self-reported paper research questionnaire in a private room. Then 24-48 hours later, participants underwent a telephone interview with the Thai FSQ. The internal consistency and convergent validity of the Thai self-reported FSQ were assessed using Cronbach’s alpha and Pearson’s correlation, respectively. The agreement between the Thai self-reported FSQ (FS scale ≥13) and the telephone interview using the 2016 ACR criteria for diagnosing fibromyalgia was evaluated using Cohen’s kappa.
Results: Of 89 participants, the majority were females (66.3%) with a mean age of 53.5±15.9 years and had an educational level of bachelor’s degree or higher (79.7%). Cronbach’s alpha was 0.82, while the correlation between the FS scale and EQ-5D-5L utility was -0.48 (p <0.001). Cohen’s kappa for diagnosis agreement was 0.55 (p < 0.001).
Conclusion: The Thai self-reported FSQ exhibited good internal consistency and moderate construct validity. The diagnostic agreement of the Thai self-reported FSQ with the telephone interview was moderate. Although this questionnaire could be used as a screening tool, physicians would need to confirm the diagnosis of fibromyalgia.
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