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We tested associations between number of therapy sessions and pre\u2010post treatment changes in clinical outcomes (EDE\u2010Q global scores, binge eating, purging); adjusting for baseline measures, diagnoses, and treatment type. Secondary analyses included rapid response variables in the above outcomes by treatment session eight. Partial correlations between treatment duration and BMI changes (adjusting for intake BMI) were examined for anorexia nervosa cases. Treatment duration was not significantly associated with changes in ED outcomes after adjusting for rapid response. BMI change (weight regain) was not correlated with treatment duration in anorexia nervosa cases. Rapid response was associated with better EDE\u2010Q outcomes, but not with changes in binge eating or purging behaviors. ED outcomes are unrelated to treatment duration; rapid response is a useful prognostic indicator for treatment planning.<\/jats:p>","DOI":"10.1002\/eat.22660","type":"journal-article","created":{"date-parts":[[2017,1,20]],"date-time":"2017-01-20T21:00:35Z","timestamp":1484946035000},"page":"687-692","source":"Crossref","is-referenced-by-count":26,"title":["Is there an optimal length of psychological treatment for eating disorder pathology?"],"prefix":"10.1002","volume":"50","author":[{"given":"Caroline","family":"Bell","sequence":"first","affiliation":[{"name":"Freed Beeches Eating Disorders Service Worksop UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Glenn","family":"Waller","sequence":"additional","affiliation":[{"name":"Clinical Psychology Unit Department of Psychology, University of Sheffield Sheffield UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roz","family":"Shafran","sequence":"additional","affiliation":[{"name":"Institute of Child Health, Faculty of Population Health Sciences, University College London London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaime","family":"Delgadillo","sequence":"additional","affiliation":[{"name":"Clinical Psychology Unit Department of Psychology, University of Sheffield Sheffield UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,1,20]]},"reference":[{"key":"e_1_2_6_2_1","volume-title":"Diagnostic and statistical manual of mental disorders","author":"American Psychiatric Association","year":"1994"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1176\/appi.books.9780890423363"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/jclp.1056"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.brat.2009.11.001"},{"key":"e_1_2_6_6_1","doi-asserted-by":"crossref","first-page":"927","DOI":"10.1037\/0022-006X.64.5.927","article-title":"Dose\u2013effect relations in time\u2010limited psychotherapy for depression","volume":"64","author":"Barkham M.","year":"1996","journal-title":"Journal of Consulting and Clinical Psychology"},{"key":"e_1_2_6_7_1","volume-title":"Cognitive behavior therapy and eating disorders","author":"Bohn K.","year":"2008"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1192\/bjp.186.1.11"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/eat.20309"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.brat.2015.10.009"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1097\/MLR.0b013e31806518ac"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/bjc.12031"},{"key":"e_1_2_6_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/eat.20764"},{"key":"e_1_2_6_14_1","doi-asserted-by":"publisher","DOI":"10.1002\/1098-108X(199412)16:4<363::AID-EAT2260160405>3.0.CO;2-#"},{"key":"e_1_2_6_15_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0033291711001875"},{"key":"e_1_2_6_16_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1021751307358"},{"issue":"4","key":"e_1_2_6_17_1","first-page":"CD000562","article-title":"Psychological treatments for bulimia nervosa and binging","volume":"7","author":"Hay P. 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