Smith, J., Morgan, P. J, Lonsdale, C., Dally, K., Plotnikoff, R. C & Lubans, D. (2017). Mediators of change in screen-time in a school-based intervention for adolescent boys: findings from the ATLAS cluster randomized controlled trial. Journal of Behavioral Medicine,40(3), A. Christensen. 423-433. United States: Springer New York LLC. Retrieved from https://doi.org/10.1007/s10865-016-9810-2
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 multimediator 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.
Institute for Positive Psychology and Education
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