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Internet\u2010delivered treatment may reduce current barriers.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objective<\/jats:title><jats:p>This study aimed to assess the efficacy of a new online CBT of bulimic symptoms.<\/jats:p><\/jats:sec><jats:sec><jats:title>Method<\/jats:title><jats:p>Participants with bulimic symptoms (<jats:italic>n<\/jats:italic>\u2009=\u2009105) were randomly allocated to online CBT, bibliotherapy or waiting list\/delayed treatment condition. Data were gathered at pre\u2010treatment, post\u2010treatment and 1\u2010year follow\u2010up.<\/jats:p><\/jats:sec><jats:sec><jats:title>Outcome Measures<\/jats:title><jats:p>The primary outcome measures were the Eating Disorder Examination Questionnaire (EDE\u2010Q) and the frequency of binge eating and purging episodes. The secondary outcome measure was the Body Attitude Test.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Dropout from Internet treatment was 26%. Intention\u2010to\u2010treat ANCOVAs of post\u2010test data revealed that the EDE\u2010Q scores and the frequency of binging and purging reduced more in the online CBT group compared with the bibliotherapy and waiting list groups (pooled between\u2010group effect size: <jats:italic>d<\/jats:italic>\u2009=\u20090.9). At 1\u2010year follow\u2010up, improvements in the online CBT group had sustained.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>This study identifies online CBT as a viable alternative in the treatment of bulimic symptoms. Copyright \u00a9 2012 John Wiley &amp; Sons, Ltd.<\/jats:p><\/jats:sec><jats:sec><jats:title>Key Practitioner Message<\/jats:title><jats:p><jats:list list-type=\"bullet\"><jats:list-item><jats:p>In comparison with no treatment and unsupported bibliotherapy, online CBT induces strong reductions in bulimic symptoms.<\/jats:p><\/jats:list-item><jats:list-item><jats:p>Internet\u2010delivered treatment may provide an acceptable treatment alternative for bulimic patients who are reticent about face\u2010to\u2010face contact.<\/jats:p><\/jats:list-item><jats:list-item><jats:p>Therapist support appears to be a critical determinant of treatment adherence and effectiveness.<\/jats:p><\/jats:list-item><jats:list-item><jats:p>Unsupported bibliotherapy may have only small immediate effects but may increase the probability of recovery in the long term by promoting positive attitudes towards treatment.<\/jats:p><\/jats:list-item><\/jats:list><\/jats:p><\/jats:sec><\/jats:sec>","DOI":"10.1002\/cpp.1767","type":"journal-article","created":{"date-parts":[[2012,2,2]],"date-time":"2012-02-02T04:15:57Z","timestamp":1328156157000},"page":"308-318","source":"Crossref","is-referenced-by-count":72,"title":["Online Cognitive\u2013Behavioural Treatment of Bulimic Symptoms: A Randomized Controlled Trial"],"prefix":"10.1002","volume":"20","author":[{"given":"Jeroen","family":"Ruwaard","sequence":"first","affiliation":[{"name":"Department of Clinical Psychology University of Amsterdam  Amsterdam The Netherlands"},{"name":"Interapy PLC  Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alfred","family":"Lange","sequence":"additional","affiliation":[{"name":"Department of Clinical Psychology University of Amsterdam  Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janneke","family":"Broeksteeg","sequence":"additional","affiliation":[{"name":"Interapy PLC  Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aitziber","family":"Renteria\u2010Agirre","sequence":"additional","affiliation":[{"name":"Interapy PLC  Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bart","family":"Schrieken","sequence":"additional","affiliation":[{"name":"Interapy PLC  Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Conor V.","family":"Dolan","sequence":"additional","affiliation":[{"name":"Department of Clinical Psychology University of Amsterdam  Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul","family":"Emmelkamp","sequence":"additional","affiliation":[{"name":"Department of Clinical Psychology University of Amsterdam  Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2012,2]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1080\/16506070903318960"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1097\/00131746\u2013200409000\u201300004"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.5694\/j.1326-5377.2002.tb04955.x"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/eat.20948"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1037\/0022\u2013006X.66.4.616"},{"key":"e_1_2_7_7_1","volume-title":"Statistical Power Analysis for the Behavioral Sciences","author":"Cohen J.","year":"1988"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.2307\/2530051"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1744-6163.2008.00183.x"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1098\u2013108X(199901)25:1<39::AID\u2013EAT5>3.0.CO;2\u2013W"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1080\/16506070802694776"},{"key":"e_1_2_7_12_1","first-page":"35","article-title":"De DASS: Een vragenlijst voor het meten van depressie, angst en stress. 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