{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,31]],"date-time":"2026-03-31T10:06:56Z","timestamp":1774951616958,"version":"3.50.1"},"reference-count":34,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2026,3,29]],"date-time":"2026-03-29T00:00:00Z","timestamp":1774742400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Medicina"],"abstract":"<jats:p>Background and Objectives: To assess the reliability and construct validity of the Functional Rating Index (FRI) in Italian-speaking individuals with chronic non-specific low back pain (CLBP), in order to improve assessment and clinical management in this population. Materials and Methods: This cross-sectional study consecutively enrolled 75 individuals with CLBP (52 females; mean age 48.71 \u00b1 19.18 years; mean pain duration 298.64 \u00b1 427.52 weeks). Internal consistency and test\u2013retest reliability were evaluated using Cronbach\u2019s \u03b1 and the intraclass correlation coefficient [ICC2,1], respectively, while measurement error was estimated through the minimum detectable change (MDC). Construct validity was examined by testing a priori hypotheses through correlations (Pearson\u2019s r) between the FRI and disability measures (Roland\u2013Morris Disability Questionnaire, RMQ; Oswestry Disability Index, ODI), pain intensity (Numerical Rating Scale, NRS), and quality of life (Short-Form Health Survey, SF-36). Results: Cronbach\u2019s \u03b1 was 0.88, and test\u2013retest reliability showed an ICC2,1 of 0.86 (95%CI: 0.82\u20130.93). The MDC was 18.05, corresponding to approximately 20% of the total score. The Italian FRI demonstrated strong correlations with the RMQ (r = 0.70) and ODI (r = 0.77), and a moderate correlation with the NRS (r = 0.60). The physical and social domains of the SF-36 showed stronger negative correlations with the FRI than the mental and emotional domains. Conclusions: The Italian version of the FRI is a reliable and valid instrument for individuals with CLBP and is recommended for both clinical practice and research applications.<\/jats:p>","DOI":"10.3390\/medicina62040653","type":"journal-article","created":{"date-parts":[[2026,3,30]],"date-time":"2026-03-30T13:40:52Z","timestamp":1774878052000},"page":"653","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Reliability, Minimum Detectable Change and Construct Validity of the Functional Rating Index in Italian Patients with Chronic Non-Specific Low Back Pain"],"prefix":"10.3390","volume":"62","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8694-1404","authenticated-orcid":false,"given":"Teresa","family":"Paolucci","sequence":"first","affiliation":[{"name":"Department of Oral, Medical and Biotechnological Sciences, Physical Medicine and Rehabilitation, University G. D\u2019Annunzio, 66100 Chieti, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4816-9126","authenticated-orcid":false,"given":"Letizia","family":"Pezzi","sequence":"additional","affiliation":[{"name":"Rehabilitation Unit, ASST Cremona\u2014Ospedale di Cremona, 26100 Cremona, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2356-811X","authenticated-orcid":false,"given":"Andrea","family":"Pantalone","sequence":"additional","affiliation":[{"name":"Department of Medicine and Science of Aging, University G. D\u2019Annunzio, 66100 Chieti, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2385-5840","authenticated-orcid":false,"given":"Rocco","family":"Palumbo","sequence":"additional","affiliation":[{"name":"Department of Psychological, Health, and Territorial Sciences, University G. D\u2019Annunzio, 66100 Chieti, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Roberto","family":"Di Deo Iurisci","sequence":"additional","affiliation":[{"name":"Department of Oral, Medical and Biotechnological Sciences, Physical Medicine and Rehabilitation, University G. D\u2019Annunzio, 66100 Chieti, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4100-9189","authenticated-orcid":false,"given":"Federico","family":"Arippa","sequence":"additional","affiliation":[{"name":"Department of Mechanical, Chemical and Materials Engineering, University of Cagliari, 09141 Cagliari, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-1170-3932","authenticated-orcid":false,"given":"Alice","family":"Cichelli","sequence":"additional","affiliation":[{"name":"Department of Oral, Medical and Biotechnological Sciences, Physical Medicine and Rehabilitation, University G. D\u2019Annunzio, 66100 Chieti, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1183-8792","authenticated-orcid":false,"given":"Ronald J.","family":"Feise","sequence":"additional","affiliation":[{"name":"Institute of Evidence-Based Chiropractic, Scottsdale, AZ 85254, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marco","family":"Monticone","sequence":"additional","affiliation":[{"name":"Department of Clinical and Experimental Sciences, Universit\u00e0 di Brescia, 24123 Brescia, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"159","DOI":"10.1016\/j.jphys.2019.04.010","article-title":"Recurrence of low back pain is common: A pro-spective inception cohort study","volume":"65","author":"Mills","year":"2019","journal-title":"J. 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