Abstract
Background: To evaluate the effectiveness of descriptive norms in promoting physical activity among adolescents by measuring step counts via a randomized controlled trial (NCT03081013). Methods: A total of 311 participants aged 13-16 were randomized into two study arms (Onymous and Anonymous Arms). Each arm consisted of 13 groups of 12 participants. During the trial, participants received weekly short message service (SMS) about their past week’s physical activity performance Participants in the Anonymous Arm received information about step counts of group members ranked from highest to lowest. Participants in the Onymous Arm received the same information with the group members’ full names. Participants’ quality of life, depression, and physical activity social support, self-efficacy and enjoyment before and after the intervention were also evaluated. Results: The number of steps was not higher when descriptive norm message was onymous compared to when it was anonymous. Scores in quality of life, depression, social support, self-efficacy, and enjoyment of physical activity were not significantly different between both arms (p>0.05). Conclusions: Our findings indicated that promotion of physical activity requires a multi-faceted approach. We recommend using a more relevant reference group to use social norms as a tool to increase physical activity among adolescents.
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