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Differences in baseline predictors were assessed using ANOVA and\n                      <jats:italic>\u03c7<\/jats:italic>\n                      <jats:sup>2<\/jats:sup>\n                      , and moderate\u2010to\u2010vigorous physical activity (MVPA) measures were analyzed using multi\u2010level linear mixed models.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Three trajectories were identified: Low\u2010Affect (\n                      <jats:italic>n<\/jats:italic>\n                      \u00a0=\u00a057), Mid\u2010Affect (\n                      <jats:italic>n<\/jats:italic>\n                      \u00a0=\u00a058), and High\u2010Affect (\n                      <jats:italic>n<\/jats:italic>\n                      \u00a0=\u00a022). Participants in Mid\u2010Affect and High\u2010Affect reported higher levels of being partnered and incomes &gt;\u00a0$60,000, while those in Low\u2010Affect reported worse baseline psychosocial and health\u2010related quality of life factors (\n                      <jats:italic>p<\/jats:italic>\n                      \u00a0&lt;\u00a00.05). By 6\u00a0months, MVPA goal adherence for\u00a0Low\u2010Affect and Mid\u2010Affect groups declined to 53% (SE\u00a0=\u00a013%) and 65% (SE\u00a0=\u00a013%), respectively, whereas participants in High\u2010Affect achieved the intervention's target of 150 MVPA min\/week and sustained nearly 100% goal adherence. Increases in MVPA min\/week over 6\u2010months were largest among those in High\u2010Affect (+32.3 [SE\u00a0=\u00a011.5]) compared to those in Low\u2010Affect (+18.9 [SE\u00a0=\u00a07.6]) and Mid\u2010Affect (+26.1 [SE\u00a0=\u00a07.3]), with no between\u2010group differences (\n                      <jats:italic>p<\/jats:italic>\n                      \u00a0&gt;\u00a00.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>These findings highlight variation in positive affect trajectories, their baseline predictors, and how they relate to MVPA goal adherence. Interventions that foster positive affect related to PA and offer support based on positive affect trajectory may improve MVPA and survivorship outcomes for YACS.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Clinical Trial Registration<\/jats:title>\n                    <jats:p>\n                      ClinicalTrials.gov ID: NCT03569605,\n                      <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/clinicaltrials.gov\/study\/NCT03569605\">https:\/\/clinicaltrials.gov\/study\/NCT03569605<\/jats:ext-link>\n                      .\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/pon.70484","type":"journal-article","created":{"date-parts":[[2026,5,14]],"date-time":"2026-05-14T19:58:48Z","timestamp":1778788728000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Disentangling Positive Affect Heterogeneity in a Digital Physical Activity Intervention for Young Adult Cancer Survivors: A Group\u2010Based Multi\u2010Trajectory Modeling Approach"],"prefix":"10.1002","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5595-6702","authenticated-orcid":false,"given":"Susanna M.","family":"Choi","sequence":"first","affiliation":[{"name":"Department of Nutrition Gillings School of Global Public Health University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"},{"name":"Lineberger Comprehensive Cancer Center University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0114-1660","authenticated-orcid":false,"given":"Erik A.","family":"Willis","sequence":"additional","affiliation":[{"name":"Lineberger Comprehensive Cancer Center University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"},{"name":"Center for Health 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