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This study aimed to translate the original English FACS and FDAQ into Brazilian (Br) Portuguese and assess their measurement properties in patients with Chronic Low Back Pain (CLBP). One hundred thirty volunteers with CLBP participated in this study. Structural validity, internal consistency, test-retest reliability, and hypothesis testing for construct validity were analyzed. Results indicated a 2-factor solution for the FACS-Br, while the FDAQ-Br had a one-factor solution. Internal consistency showed acceptable Cronbach\u2019s alpha (alpha &gt;.8). Suitable reliability was found for the FDAQ-Br (Intraclass Correlation Coefficient [ICC] = .98). For both FACS-Br factors, suitable reliability was found as well (ICC = .95 and .94). Hypothesis testing for construct validity confirmed more than 75% of the hypotheses proposed a priori for the FACS maladaptive pain\/movement-related beliefs domain and the FDAQ-Br. In conclusion, the FACS-Br and FDAQ-Br demonstrated acceptable reliability, internal consistency, and structural validity measurement properties and their correlation (r &lt; .50) suggests that the tools are not interchangeable measures.<\/jats:p>","DOI":"10.1177\/01632787241264588","type":"journal-article","created":{"date-parts":[[2024,7,22]],"date-time":"2024-07-22T10:50:45Z","timestamp":1721645445000},"page":"336-346","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":3,"title":["Measurement Properties of Two Questionnaires Assessing Fear-Avoidance in Patients With Chronic Low Back Pain"],"prefix":"10.1177","volume":"48","author":[{"given":"Gabriela Zuelli","family":"Martins Silva","sequence":"first","affiliation":[{"name":"University of S\u00e3o Paulo - USP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mariana Romano","family":"de Lira","sequence":"additional","affiliation":[{"name":"University of S\u00e3o Paulo - USP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5176-6407","authenticated-orcid":false,"given":"Luiz Ricardo","family":"Garc\u00eaz","sequence":"additional","affiliation":[{"name":"Federal University of S\u00e3o Carlos - UFSCar, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven Z.","family":"George","sequence":"additional","affiliation":[{"name":"Duke University School of Medicine, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Randy","family":"Neblett","sequence":"additional","affiliation":[{"name":"PRIDE Research Foundation, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adriano","family":"Pezolato","sequence":"additional","affiliation":[{"name":"University of S\u00e3o Paulo - USP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thamiris Costa","family":"Lima","sequence":"additional","affiliation":[{"name":"Federal University of S\u00e3o Carlos - UFSCar, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6222-4961","authenticated-orcid":false,"given":"Thais Cristina","family":"Chaves","sequence":"additional","affiliation":[{"name":"University of S\u00e3o Paulo - USP, Brazil"},{"name":"Federal University of S\u00e3o Carlos - UFSCar, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2024,7,22]]},"reference":[{"key":"e_1_3_5_2_1","doi-asserted-by":"publisher","DOI":"10.1097\/BRS.0000000000003188"},{"key":"e_1_3_5_3_1","doi-asserted-by":"publisher","DOI":"10.1590\/S0102-311X2008000300015"},{"key":"e_1_3_5_4_1","doi-asserted-by":"publisher","DOI":"10.1097\/00007632-200012150-00014"},{"key":"e_1_3_5_5_1","doi-asserted-by":"publisher","DOI":"10.1177\/0049124192021002004"},{"key":"e_1_3_5_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1745-3984.1968.tb00625.x"},{"key":"e_1_3_5_7_1","volume-title":"Basic concepts, applications, and programming","author":"Byrne B. 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