Abstract
BackgroundTo verify the validity of the 2016-revised Fibromyalgia Survey Questionnaire (FSQ) by telephone interview compared to self-administration and to produce a valid version of FSQ in Brazilian Portuguese language.MethodsThe Brazilian version of FSQ was produced following the recommendations for cross-cultural adaptation. Validity of Brazilian FSQ self-administration was assessed by checking agreement of its results with fibromyalgia diagnosis according the 1990 American College of Rheumatology (ACR) criteria. Reproducibility and validity of FSQ by telephone were assessed by comparing its results with the previous FSQ self-administration.ResultsA Brazilian Portuguese version (FSQ-Brazil) was produced. FSQ-Brazil had good internal consistency (Cronbach’s alpha between 0.73 and 0.94). Agreement between the results obtained by self-administration of FSQ-Brazil and by telephone interview was substantial or almost perfect for almost all questions about pain sites and all questions about other somatic symptoms (Cohen’s kappa higher than 0.6). There were small but significant bias toward higher scores of widespread pain index and fibromyalgia severity scale in the telephone interview compared to self-administration. Fibromyalgia definition by self-administration and telephone interview with FSQ-Brazil both revealed substantial agreement with the diagnosis based on ACR 1990 criteria (Cohen’s kappa 0.62 and 0.65; respectively).ConclusionsFSQ-Brazil demonstrated good internal consistency, reproducibility and validity both by self-administration and by telephone interview. However, caution must be taken with the interpretation of quantitative scores of widespread pain index and symptoms severity scale, which slightly differed according the method (self-administration or interview) in our study.
Highlights
To verify the validity of the 2016-revised Fibromyalgia Survey Questionnaire (FSQ) by telephone interview compared to self-administration and to produce a valid version of FSQ in Brazilian Portuguese language
The 2010 American College of Rheumatology (ACR) fibromyalgia criteria allows its diagnosis without the requirement for tender point ascertainment, which was the basis of 1990 ACR criteria, but was still based on physician assessment [1]
In the self-administration of FSQ-Brazil, 116 subjects were initially enrolled, but one patient needed to be excluded from the study because of illiteracy and 15 were excluded because would not be available for the telephone interview
Summary
To verify the validity of the 2016-revised Fibromyalgia Survey Questionnaire (FSQ) by telephone interview compared to self-administration and to produce a valid version of FSQ in Brazilian Portuguese language. The 2010 American College of Rheumatology (ACR) fibromyalgia criteria allows its diagnosis without the requirement for tender point ascertainment, which was the basis of 1990 ACR criteria, but was still based on physician assessment [1]. Their modification performed in 2011 allows the evaluation to be entirely accomplished by self-report. It stablished an instrument suitable to assess fibromyalgia for surveys, eliminating the need for an examiner It was called Fibromyalgia Survey Questionnaire (FSQ) [2] and its latest revision was performed in 2016 [3]. Pain sites were grouped into five regions, and diagnosis of fibromyalgia can be done if: 1) there is pain in at least four of the five regions; 2) symptoms are present for at least 3 months; 3) WPI is greater than or equal to seven and the SSS is greater than or equal to five or WPI is four to six and the SSS is greater than or equal to nine [3]
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