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An examination of remission across the history of research on family therapy for AN shows that earlier studies adopted lenient definitions and generally yielded higher rates of remission than studies of the past decade that have used stricter definitions of remission. In this study, we investigate the reactivity of remission rates to the application of different definitions of remission used within the family therapy for AN literature, within a single RCT data set.<\/jats:p><\/jats:sec><jats:sec><jats:title>Method<\/jats:title><jats:p>We conducted a secondary analysis of data from a single\u2010site RCT which compared the relative efficacy of two formats of family therapy in a sample of 106 Australian adolescents with AN. Using end\u2010of\u2010treatment data, we compared remission rates using 11 definitions of remission that have been used in studies of family therapy for AN spanning more than three decades.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>We found wide variability in remission rates (21.7\u201387.7%; Cochran's Q <jats:italic>\u03c7<\/jats:italic><jats:sup>2<\/jats:sup>(10, <jats:italic>N<\/jats:italic> = 106) = 303.55, <jats:italic>p<\/jats:italic> = .000], depending on which definition of remission was applied. As expected, more lenient criteria produced higher remission rates than more stringent definitions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>Applying different criteria of remission to a single data set illustrates the impact of changing how remission is defined. Failure to consider the greater stringency of remission criteria in recent studies could result in false inferences concerning the efficacy of family therapy for AN over time.<\/jats:p><\/jats:sec>","DOI":"10.1002\/eat.23138","type":"journal-article","created":{"date-parts":[[2019,7,18]],"date-time":"2019-07-18T10:17:28Z","timestamp":1563445048000},"page":"996-1003","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Variability in remission in family therapy for anorexia nervosa"],"prefix":"10.1002","volume":"52","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7293-9496","authenticated-orcid":false,"given":"Daniel","family":"Le Grange","sequence":"first","affiliation":[{"name":"Department of Psychiatry University of California  San Francisco California"},{"name":"Department of Psychiatry &amp; Behavioral Neuroscience The University of Chicago (Emeritus)  Chicago Illinois"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kathryn M.","family":"Huryk","sequence":"additional","affiliation":[{"name":"Department of Psychology Fairleigh Dickinson University  Teaneck New Jersey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stuart B.","family":"Murray","sequence":"additional","affiliation":[{"name":"Department of Psychiatry University of California  San Francisco California"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4377-5610","authenticated-orcid":false,"given":"Elizabeth K.","family":"Hughes","sequence":"additional","affiliation":[{"name":"The University of Melbourne, Murdoch Children's Research Institute Royal Children's Hospital  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Susan M.","family":"Sawyer","sequence":"additional","affiliation":[{"name":"The University of Melbourne, Murdoch Children's Research Institute Royal Children's Hospital  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katharine L.","family":"Loeb","sequence":"additional","affiliation":[{"name":"Department of Psychology Fairleigh Dickinson University  Teaneck New Jersey"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,7,18]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.brat.2014.02.006"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1001\/jamapsychiatry.2014.1025"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1080\/10640260490521389"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.brat.2009.11.001"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11920-018-0932-9"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/erv.994"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/eat.22042"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/eat.20309"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/eat.20224"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1080\/10640266.2015.1042312"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1080\/21662630.2015.1009145"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.4088\/JCP.15m10393"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1111\/1469-7610.00660"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1001\/archpsyc.1997.01830230063008"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12888-016-1129-6"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-7610.2007.01726.x"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1002\/1098-108X(199412)16:4<363::AID-EAT2260160405>3.0.CO;2-#"},{"key":"e_1_2_9_19_1","unstructured":"Fairburn C. 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