https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47000 Wed 26 Jul 2023 09:22:27 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23597 Wed 11 Apr 2018 16:32:58 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27083 2 h/day). In total, 322 adolescents (mean age = 14.4 ± 0.6 years) from eight secondary schools in New South Wales, Australia were recruited. The S4HM intervention was guided by Self-Determination Theory and included: an interactive seminar, eHealth messaging, a behavioral contract and parental newsletters. The primary outcome was recreational screen-time. Secondary outcomes included mental health (i.e., well-being, psychological distress, self-perceptions), objectively measured physical activity, and body mass index (BMI). Outcome analyses were conducted using linear mixed models and mediation was examined using a product-of-coefficients test. Results: At post-intervention, significant reductions in screen-time were observed in both groups, with a greater reduction observed in the intervention group (− 50 min/day versus − 29 min, p < 0.05 for both). However, the adjusted difference in change between groups was not statistically significant (mean = − 21.3 min/day, p = 0.255). There were no significant intervention effects for mental health outcomes, physical activity or BMI. Significant mediation effects for autonomous motivation were found. Conclusions: Participants in both the S4HM intervention and control groups significantly reduced their screen-time, with no group-by-time effects. Enhancing autonomous motivation might be a useful intervention target for trials aimed at reducing adolescents' recreational screen-time.]]> Wed 11 Apr 2018 16:06:47 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:15491 Wed 11 Apr 2018 09:48:11 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49003 Wed 03 May 2023 12:09:55 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:378 Tue 08 Jan 2019 15:22:58 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29074 Thu 26 Jul 2018 15:45:05 AEST ]]>