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Participants (aged 13\u201318) completed demographics, as well as measures of hope, self-agency, hopelessness, and perceived control before and after the online intervention. It was completed anonymously, and participants gave feedback. T- and chi-square tests compared completers and non-completers; pre-post effects were assessed using paired t-tests with effect sizes (Cohen\u2019s d). Thematic analysis explored feedback.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Of 799 participants, 401 (50.1%) completed the intervention, of whom 356 (88%) completed at least one post-intervention measure. Completers were more likely to be younger, have higher pre-intervention hope and self-agency, and to identify as sexual minorities. Significant improvements were found in hope and self-agency (\n                      <jats:italic toggle=\"yes\">d<\/jats:italic>\n                      = \u22120.41), hopelessness (\n                      <jats:italic toggle=\"yes\">d<\/jats:italic>\n                      = 0.52), and perceived control (\n                      <jats:italic toggle=\"yes\">d<\/jats:italic>\n                      = 0.45). Most found the intervention enjoyable and useful.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Findings support the feasibility and acceptability of Project ABC-UK, with promising immediate effects on all outcomes. Future studies should assess effects on depression and anxiety at follow-up and compared to other interventions.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/13591045261433857","type":"journal-article","created":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T19:00:31Z","timestamp":1773946831000},"page":"1047-1066","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["Immediate Effects and Experiences of a Digital Single-Session Behavioural Activation Based Intervention for Adolescents: A Single Arm Pre-post Programme Evaluation of Project ABC in the UK"],"prefix":"10.1177","volume":"31","author":[{"given":"Sara","family":"Munir","sequence":"first","affiliation":[{"name":"University of Bath"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-6405-7352","authenticated-orcid":false,"given":"Grace","family":"Perry","sequence":"additional","affiliation":[{"name":"University of Bath"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeffrey","family":"Lambert","sequence":"additional","affiliation":[{"name":"University of Bath"},{"name":"University of Bath Mental Health Research Group (MHRG)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0839-3190","authenticated-orcid":false,"given":"Maria E.","family":"Loades","sequence":"additional","affiliation":[{"name":"University of Bath"},{"name":"University of Bath Mental Health Research Group (MHRG)"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,3,19]]},"reference":[{"key":"e_1_3_7_2_1","doi-asserted-by":"publisher","DOI":"10.1093\/schbul\/sbae031"},{"key":"e_1_3_7_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/da.21971"},{"key":"e_1_3_7_4_1","doi-asserted-by":"publisher","DOI":"10.3389\/fpubh.2019.00178"},{"key":"e_1_3_7_5_1","volume-title":"Self-administered single session interventions for mental health in young people: A systematic review and meta-analysis","author":"Ball J.","year":"2024","unstructured":"Ball J., Thompson Z., Meiser-Stedman R., Chiu K. 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