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Further, this paper aimed to compare the ON\/OC relationship significance and strength based on when the ON measurement tool was developed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Method<\/jats:title><jats:p>PsycINFO, PubMed and Web of Science databases were queried for quantitative, peer\u2010reviewed studies recruiting adult participants, published in English up to April 2023. Studies not directly comparing ON and OC symptoms were excluded. After full\u2010text review and quality assessment, 40 studies were included in the systematic review and 31 studies in the meta\u2010analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>ON assessments created prior to the 2016 revised ON diagnostic criteria do not appear to fully capture OC symptoms. Studies using earlier developed ON assessments demonstrated inconsistent ON\/OC relationships whereas studies implementing more recent assessments (from 2018 onwards) found consistently significant, larger relationships, highlighting a previously underrated OC component of ON.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Early ON studies, and studies utilising early ON assessments should be interpreted with caution, particularly in relation to OC symptom involvement in ON. Future research should validate novel ON assessments and investigate common underlying factors.<\/jats:p><\/jats:sec>","DOI":"10.1002\/erv.3041","type":"journal-article","created":{"date-parts":[[2023,10,15]],"date-time":"2023-10-15T16:59:15Z","timestamp":1697389155000},"page":"257-280","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["A systematic review and meta\u2010analysis of the relationship between obsessive\u2010compulsive symptoms and symptoms of proposed orthorexia nervosa: The contribution of assessments"],"prefix":"10.1002","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8277-7176","authenticated-orcid":false,"given":"Phillipa Ann","family":"Huynh","sequence":"first","affiliation":[{"name":"Centre for Mental Health and Brain Sciences Swinburne University of Technology  Melbourne Victoria Australia"},{"name":"Department of Psychological Sciences Swinburne University of Technology  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8190-894X","authenticated-orcid":false,"given":"Stephanie","family":"Miles","sequence":"additional","affiliation":[{"name":"Department of Psychological Sciences Swinburne University of Technology  Melbourne Victoria Australia"},{"name":"Centre for Youth Mental Health The University of Melbourne  Melbourne Victoria Australia"},{"name":"Orygen  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4271-4285","authenticated-orcid":false,"given":"Kathleen","family":"de Boer","sequence":"additional","affiliation":[{"name":"Centre for Mental Health and Brain Sciences Swinburne University of Technology  Melbourne Victoria Australia"},{"name":"Department of Psychological Sciences Swinburne University of Technology  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9902-0858","authenticated-orcid":false,"given":"Denny","family":"Meyer","sequence":"additional","affiliation":[{"name":"Centre for Mental Health and Brain Sciences Swinburne University of Technology  Melbourne Victoria Australia"},{"name":"Department of Psychological Sciences Swinburne University of Technology  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0963-0335","authenticated-orcid":false,"given":"Maja","family":"Nedeljkovic","sequence":"additional","affiliation":[{"name":"Centre for Mental Health and Brain Sciences Swinburne University of Technology  Melbourne Victoria Australia"},{"name":"Department of Psychological Sciences Swinburne University of Technology  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,10,15]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.psychres.2021.113808"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.appet.2022.106261"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF03325325"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1186\/s40337\u2010019\u20100246\u20102"},{"key":"e_1_2_9_6_1","doi-asserted-by":"crossref","unstructured":"American Psychiatric Association. 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