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The online version of this article (doi:10.1007/s10865-016-9810-2) contains supplementary material, which is available to authorized users.
The mechanisms of behavior change in youth screen-time interventions are poorly understood. Participants were 361 adolescent boys (12–14 years) participating in the ATLAS obesity prevention trial, evaluated in 14 schools in low-income areas of New South Wales, Australia. Recreational screen-time was assessed at baseline, 8- and 18-months, whereas potential mediators (i.e., motivation to limit screen-time and parental rules) were assessed at baseline, 4- and 18-months. Multi-level mediation analyses followed the intention-to-treat principle and were conducted using a product-of-coefficients test. The intervention had a significant impact on screen-time at both time-points, and on autonomous motivation at 18-months. Changes in autonomous motivation partially mediated the effect on screen-time at 18-months in single and multi-mediator models [AB (95% CI) = −5.49 (−12.13, −.70)]. Enhancing autonomous motivation may be effective for limiting screen-time among adolescent males.
Trial registration: Australian New Zealand Clinical Trials Registry No: ACTRN12612000978864.
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Supplementary material 1 (DOCX 13 kb)10865_2016_9810_MOESM1_ESM.docx
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- Mediators of change in screen-time in a school-based intervention for adolescent boys: findings from the ATLAS cluster randomized controlled trial
Jordan J. Smith
Philip J. Morgan
Ronald C. Plotnikoff
David R. Lubans
- Springer US