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Participants (\n                    <jats:italic>N<\/jats:italic>\n                    \u00a0=\u200935,\n                    <jats:italic>M<\/jats:italic>\n                    <jats:sub>age<\/jats:sub>\n                    \u00a0=\u200911.6,\n                    <jats:italic>SD<\/jats:italic>\n                    <jats:sub>age<\/jats:sub>\n                    \u00a0=\u20090.62) took part in an intensive longitudinal study involving 16\u2009weeks of salivary cortisol collection and completion of a brief weekly survey. Using dynamic structural equation modeling, we tested for changes in physiological and perceived stress over time, as well as for autoregressive and cross\u2010lagged effects. Results revealed a significant decrease in physiological stress over time among youth in the program, whereas perceived stress remained low and stable. We also found that higher stress in 1\u2009week\u2014both physiological and perceived\u2014predicted higher stress in the following week (autoregressive effects), but the two types of stress did not predict one another (cross\u2010lagged effects), and these relations varied across individuals. These findings suggest that, even within the same PYD program context, different indicators of stress remain distinct and may follow person\u2010specific patterns. Implications for future PYD research and programs are discussed.\n                  <\/jats:p>","DOI":"10.1111\/aphw.70212","type":"journal-article","created":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T08:47:31Z","timestamp":1788252451000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Within\u2010person dynamics of physiological and perceived stress among South African youth in positive youth development programs"],"prefix":"10.1111","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1186-5424","authenticated-orcid":false,"given":"Roya","family":"Abbasi\u2010Asl","sequence":"first","affiliation":[{"name":"Eliot\u2010Pearson Department of Child Study and Human Development Tufts University  Medford Massachusetts 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