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The present investigation includes two studies evaluating the English LoPF-Q 12-18. In Study 1, single-factor and bifactor structures (unidimensional severity criterion and four specific factors: identity, self-direction, empathy, intimacy) were evaluated in an ethnically diverse community sample ( N = 453; age 10\u201318; 57% female). Study 2 used a community control ( n = 298; age 10\u201318; 54.4% female) and clinical sample ( n = 94; age 11\u201318; 58.5% female) to examine reliability, validity, and clinical utility. Study 1 results supported the bifactor model, with a robust general factor and little multidimensionality caused by the group factors, suggesting an essentially unidimensional structure. Study 2 revealed good internal consistency and construct validity and provided clinical cut-offs, supporting the use of the LoPF-Q 12-18 total score in research and clinical applications.<\/jats:p>","DOI":"10.1177\/10731911221124340","type":"journal-article","created":{"date-parts":[[2022,9,20]],"date-time":"2022-09-20T02:21:14Z","timestamp":1663640474000},"page":"1764-1776","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":35,"title":["Levels of Personality Functioning Questionnaire 12-18 (LoPF-Q 12-18): Factor Structure, Validity, and Clinical Cut-Offs"],"prefix":"10.1177","volume":"30","author":[{"given":"Sophie","family":"Kerr","sequence":"first","affiliation":[{"name":"University of Houston, TX, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Veronica","family":"McLaren","sequence":"additional","affiliation":[{"name":"University of Houston, TX, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kiana","family":"Cano","sequence":"additional","affiliation":[{"name":"University of Houston, TX, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Salome","family":"Vanwoerden","sequence":"additional","affiliation":[{"name":"University of Pittsburgh, PA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kirstin","family":"Goth","sequence":"additional","affiliation":[{"name":"Psychiatric University Clinics Basel, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8349-4701","authenticated-orcid":false,"given":"Carla","family":"Sharp","sequence":"additional","affiliation":[{"name":"University of Houston, TX, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2022,9,19]]},"reference":[{"key":"bibr1-10731911221124340","volume-title":"Standards for educational and psychological testing","author":"American Educational Research Association, American Psycho-logical Association, &amp; National Council on Measurement in Education","year":"2014"},{"key":"bibr2-10731911221124340","unstructured":"American Psychiatric Association. 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