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The goal of this meta\u2010analysis was to quantify the association between pretreatment motivation and posttreatment changes in eating disorder symptomology.<\/jats:p><\/jats:sec><jats:sec><jats:title>Method<\/jats:title><jats:p>We reviewed 196 longitudinal studies reporting on change on indices of overall eating\u2010disorder symptomatology, weight gain, binge\u2010eating, vomiting, anxiety\/depression, and treatment adherence. Meta\u2010analyses were performed using two complementary approaches: (a) combined probability analysis using the added <jats:italic>Z<\/jats:italic>'s method; (b) effect size analyses. Using random\u2010effect models, effect sizes were pooled when there were at least three studies with the same type of statistical design and reporting statistics on the same outcome. Heterogeneity in study outcome was evaluated using <jats:italic>Q<\/jats:italic> and <jats:italic>I<\/jats:italic><jats:sup>2<\/jats:sup> statistics. Studies were reviewed qualitatively when the number of studies or reported data were insufficient to perform a meta\u2010analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Forty\u2010two articles were included. Although samples and treatments differed substantially across studies, results across studies were remarkably consistent. Both combined\u2010probability and effect\u2010size analyses indicated positive effects of pretreatment motivation on improvement in general eating\u2010disorder symptoms (Cohen's <jats:italic>r<\/jats:italic> = .17), and an absence of effects on anxiety\/depression symptoms. Remaining outcome indices were subject to selective reporting and\/or small sample size bias.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>Our findings underscore the importance of incorporating treatment engagement approaches in the treatment of eating disorders. Optimal reporting of study findings and improving study quality would improve future efforts to obtain an in\u2010depth understanding of the relationship between motivation and eating disorder symptoms.<\/jats:p><\/jats:sec>","DOI":"10.1002\/eat.23376","type":"journal-article","created":{"date-parts":[[2020,9,21]],"date-time":"2020-09-21T09:18:18Z","timestamp":1600679898000},"page":"1879-1900","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Pretreatment motivation and therapy outcomes in eating disorders: A systematic review and meta\u2010analysis"],"prefix":"10.1002","volume":"53","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0701-4643","authenticated-orcid":false,"given":"Jeanne","family":"Sansfa\u00e7on","sequence":"first","affiliation":[{"name":"Eating Disorders Continuum Douglas Mental Health University Institute  Montreal Quebec Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0863-8098","authenticated-orcid":false,"given":"Linda","family":"Booij","sequence":"additional","affiliation":[{"name":"Department of Psychology Concordia University  Montreal Quebec Canada"},{"name":"Centre de Recherche de l'H\u00f4pital Sainte\u2010Justine Universit\u00e9 de Montr\u00e9al  Montreal Quebec Canada"},{"name":"Department of Psychiatry McGill University  Montreal Quebec Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lise","family":"Gauvin","sequence":"additional","affiliation":[{"name":"Centre de Recherche du Centre Hospitalier Universit\u00e9 de Montr\u00e9al  Montreal Quebec Canada"},{"name":"Department of Social &amp; Preventive Medicine \u00c9cole de sant\u00e9 publique, Universit\u00e9 de Montr\u00e9al  Montreal Quebec Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00c9milie","family":"Fletcher","sequence":"additional","affiliation":[{"name":"Eating Disorders Continuum Douglas Mental Health University Institute  Montreal Quebec Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Farah","family":"Islam","sequence":"additional","affiliation":[{"name":"Department of Public Health and Primary Care KU Leuven  Leuven Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mimi","family":"Isra\u00ebl","sequence":"additional","affiliation":[{"name":"Eating Disorders Continuum Douglas Mental Health University Institute  Montreal Quebec Canada"},{"name":"Department of Psychiatry McGill University  Montreal Quebec Canada"},{"name":"Research Centre Douglas Mental Health University Institute  Montreal Quebec Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Howard","family":"Steiger","sequence":"additional","affiliation":[{"name":"Eating Disorders Continuum Douglas Mental Health University Institute  Montreal Quebec Canada"},{"name":"Department of Psychiatry McGill University  Montreal Quebec Canada"},{"name":"Research Centre Douglas Mental Health University Institute  Montreal Quebec Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,9,21]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1186\/1471-244X-14-69"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40519-014-0153-0"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/erv.1131"},{"key":"e_1_2_9_5_1","unstructured":"Bates M.(2012). 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