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The current study was undertaken to examine and compare the psychometric properties of the English and French versions of the University of California, Los Angeles, Loneliness Scale\u20106 (ULS\u20106) in patients with SSc during the COVID\u201019 pandemic.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This study used baseline cross\u2010sectional data from 775 adults enrolled in the Scleroderma Patient\u2010Centered Intervention Network (SPIN) COVID\u201019 Cohort. Reliability and validity of ULS\u20106 scores overall and between languages were evaluated using confirmatory factor analysis (CFA), differential item functioning (DIF) through the multiple\u2010indicator multiple\u2010cause (MIMIC) model, omega\/alpha calculation, and correlations of hypothesized convergent relationships.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>CFA for the total sample supported the single\u2010factor structure (comparative fit index [CFI] 0.96, standardized root mean residual [SRMR] 0.03), and all standardized factor loadings for items were large (0.60\u20130.86). The overall MIMIC model with language as a covariate fit well (CFI 0.94, SRMR 0.04, root mean square error of approximation 0.11). Statistically significant DIF was found for 3 items across language (\u03b2<jats:sub>item2<\/jats:sub>\u00a0=\u00a00.14, <jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001; \u03b2<jats:sub>item4<\/jats:sub>\u00a0=\u00a0\u20130.07, <jats:italic>P<\/jats:italic>\u00a0=\u00a00.01; \u03b2<jats:sub>item6<\/jats:sub>\u00a0=\u00a00.13, <jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001), but these small differences were without practical measurement implications. Analyses demonstrated high internal consistency with no language\u2010based convergent validity differences.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Analyses demonstrated evidence of acceptable reliability and validity of ULS\u20106 scores in English\u2010 and French\u2010speaking adults with SSc. DIF analysis supported use of the ULS\u20106 to examine comparative experiences of loneliness without adjusting for language.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acr.25115","type":"journal-article","created":{"date-parts":[[2023,3,20]],"date-time":"2023-03-20T04:53:58Z","timestamp":1679288038000},"page":"2158-2165","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Evaluation of Measurement Properties and Differential Item Functioning in the English and French Versions of the University of California, Los Angeles, Loneliness Scale\u20106: A Scleroderma <scp>Patient\u2010Centered<\/scp> Intervention Network (<scp>SPIN<\/scp>) Study"],"prefix":"10.1002","volume":"75","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5140-289X","authenticated-orcid":false,"given":"Chelsea","family":"S. Rapoport","sequence":"first","affiliation":[{"name":"San Diego State University\/University of California San Diego Joint Doctoral Program in Clinical Psychology  San Diego California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2389-8533","authenticated-orcid":false,"given":"Alyssa K.","family":"Choi","sequence":"additional","affiliation":[{"name":"San Diego State University\/University of California San Diego Joint Doctoral Program in Clinical Psychology  San Diego California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Linda","family":"Kwakkenbos","sequence":"additional","affiliation":[{"name":"Radboud University  Nijmegen The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marie\u2010Eve","family":"Carrier","sequence":"additional","affiliation":[{"name":"Jewish General Hospital  Montreal Quebec Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard S.","family":"Henry","sequence":"additional","affiliation":[{"name":"Jewish General Hospital and McGill University  Montreal Quebec Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luc","family":"Mouthon","sequence":"additional","affiliation":[{"name":"Reference Center for Rare Systemic Autoimmune Diseases of Ile de France, H\u00f4pital Cochin, AP\u2010HP, Universit\u00e9 Paris Descartes  Paris France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Scott C.","family":"Roesch","sequence":"additional","affiliation":[{"name":"San Diego State University\/University of California San Diego Joint Doctoral Program in Clinical Psychology and San Diego State University  San Diego California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5644-8432","authenticated-orcid":false,"given":"Brett D.","family":"Thombs","sequence":"additional","affiliation":[{"name":"Jewish General Hospital and McGill University  Montreal Quebec Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7526-9982","authenticated-orcid":false,"given":"Vanessa L.","family":"Malcarne","sequence":"additional","affiliation":[{"name":"San Diego State University\/University of California San Diego Joint Doctoral Program in Clinical Psychology and San Diego State University  San Diego California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"name":"the SPIN COVID\u201019 Patient Advisory Team","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"name":"the SPIN 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