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Research has yet to compare how perceptions of treatment credibility and outcome expectancy (i.e., how suitable and effective the treatment will be) may differ between ultra\u2010brief and standard\u2010length digital treatments.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      In a secondary analysis of a randomized controlled trial (\n                      <jats:italic>N<\/jats:italic>\n                      \u2009=\u2009152), the current study examined the distribution of credibility and expectancy prior to receiving either an ultra\u2010brief or standard\u2010length digital transdiagnostic treatment based on cognitive behaviour therapy and explored whether these variables predicted improvement in anxiety or depression symptoms.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>There were no differences in how credible and effective participants perceived the two treatment options. In binary logistic regressions, higher credibility and expectancy were associated with greater odds of experiencing a clinically meaningful improvement (\u2265\u200930% reduction) in anxiety (credibility OR\u2009=\u20091.68 [95% CI 1.15, 2.44]; expectancy OR\u2009=\u20091.50 [95% CI 1.11, 2.02]) and depression symptoms (credibility OR\u2009=\u20091.45 [95% CI 1.02, 2.05]; expectancy OR\u2009=\u20091.34 [95% CI 1.03, 1.76]) for the standard\u2010length treatment only. The predictive value of these two variables diminished when they were entered into the models together, highlighting their conceptual overlap. Findings also indicated a potential moderating role for treatment preference.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Credibility and expectancy predict treatment outcomes for standard\u2010length digital treatment. Their influence on outcomes in ultra\u2010brief digital treatment is unclear and further research with larger samples is warranted.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/bjc.70069","type":"journal-article","created":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T04:55:15Z","timestamp":1780289715000},"page":"1276-1292","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Credibility and expectancy associated with ultra\u2010brief and standard\u2010length digital treatments: A preliminary examination of impact on treatment outcome"],"prefix":"10.1111","volume":"65","author":[{"given":"Melanie","family":"Seshadri","sequence":"first","affiliation":[{"name":"eCentreClinic, School of Psychological Sciences Macquarie University  Sydney Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Blake F.","family":"Dear","sequence":"additional","affiliation":[{"name":"eCentreClinic, School of Psychological Sciences Macquarie University  Sydney Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4354-3684","authenticated-orcid":false,"given":"Madelyne A.","family":"Bisby","sequence":"additional","affiliation":[{"name":"eCentreClinic, School of Psychological Sciences Macquarie University  Sydney Australia"},{"name":"Lifespan Health and Wellbeing Research Centre Macquarie University  Sydney Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,5,31]]},"reference":[{"key":"e_1_2_11_2_1","unstructured":"Australian Bureau of Statistics. 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