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Retention, engagement, and associations between severity of illness and engagement were evaluated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Significantly more participants in the Watch group completed the study (<jats:italic>p<\/jats:italic>\u00a0=\u00a0.045); this group had greater engagement than the iPhone group (<jats:italic>p<\/jats:italic>'s\u2009&lt;\u2009.05; pseudo\u2010<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup><jats:sub>McFadden<\/jats:sub> effect size\u00a0=\u00a0.01\u2013.34). Overall, binge\u2010eating episodes, reported for the previous 28\u2009days, were significantly reduced from baseline (mean\u00a0=\u00a012.3) to endpoint (mean\u00a0=\u00a06.4): most participants in the Watch (60%) and iPhone (66%) groups reported reduced binge\u2010eating episodes from baseline to endpoint. There were no significant group differences across measures of binge eating. In the Watch group, participants with fewer episodes of binge eating at baseline were more engaged (<jats:italic>p<\/jats:italic>'s\u2009&lt;\u2009.05; pseudo\u2010<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup><jats:sub>McFadden<\/jats:sub>\u00a0=\u00a0.01\u2013.02). Engagement did not significantly predict binge eating at endpoint nor change in binge\u2010eating episodes from baseline to endpoint for both the Watch and iPhone groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>Using wearable technology alongside iPhones to deliver an eating disorder app may improve study completion and app engagement compared with using iPhones alone.<\/jats:p><\/jats:sec>","DOI":"10.1002\/eat.23726","type":"journal-article","created":{"date-parts":[[2022,5,3]],"date-time":"2022-05-03T06:20:42Z","timestamp":1651558842000},"page":"1031-1041","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Retention, engagement, and binge\u2010eating outcomes: Evaluating feasibility of the <scp>Binge\u2010Eating Genetics Initiative<\/scp> study"],"prefix":"10.1002","volume":"55","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2661-7987","authenticated-orcid":false,"given":"Rachael E.","family":"Flatt","sequence":"first","affiliation":[{"name":"Department of Psychiatry University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"},{"name":"Department of Psychology and Neuroscience University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laura M.","family":"Thornton","sequence":"additional","affiliation":[{"name":"Department of Psychiatry University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tosha","family":"Smith","sequence":"additional","affiliation":[{"name":"Department of Psychiatry University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hannah","family":"Mitchell","sequence":"additional","affiliation":[{"name":"Department of Psychology East Tennessee State University  Johnson City Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stuart","family":"Argue","sequence":"additional","affiliation":[{"name":"Recovery Record  Palo Alto California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brian R. 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