Abstract
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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
