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Objective <p>Screen-based sedentary behavior (SB) is associated with elevated BMI; however, the underlying mechanisms remain poorly understood. This study investigates the mediating role of weight concern in the SB-BMI relationship and examines how body image perception and gender moderate this mediation. By focusing on body image as a critical contextual factor, the study aims to inform targeted interventions for adolescent obesity and overweight.</p> Methods <p>In 2016, self-report questionnaires assessing screen-based SB, weight concern, and body image perception were collected from 508 Chinese adolescents (grades 7–9), yielding 438 valid responses (response rate: 86.22%). Path analysis and bootstrap procedures with bias-corrected 95% confidence intervals were used for data analysis.</p> Results <p>Screen-based SB was positively associated with weight concern (<i>b</i> = 1.115, <i>p</i> = 0.009) and BMI (<i>b</i> = 0.183, <i>p</i> &lt; 0.001). The mediation analysis showed that weight concern partially mediated this relationship, with an indirect effect of 0.056 (<i>95% CI</i> = [0.006, 0.114]). This mediation was moderated by body image perception and gender. Specifically, the interaction between BMI overestimation and weight concern was negatively associated with BMI (<i>b</i>=-0.157, <i>p</i> = 0.011), whereas the three-way interaction of gender, weight concern, and overestimated body image perception showed a positive association with BMI (<i>b</i> = 0.080, <i>p</i> = 0.025).</p> Conclusions <p>Screen-based SB influences BMI, with weight concern as a mediator and body image perception and gender as moderators. These findings highlight the importance of targeting sedentary behavior and body image concerns in gender-sensitive interventions for adolescents.</p>

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Screen-based sedentary behavior and BMI among Chinese adolescents: weight concern as a mediator moderated by body image perception

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月3日

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  • Shuoyuan Tan,
  • Libo Zhou,
  • Gulqihra Abdukerima,
  • Wei Yin,
  • Ning Chen,
  • Ling Yuan,
  • Ya Gao,
  • Pauline Sung-Chan Po Lin,
  • Zhaoxin Wang,
  • Jianwei Shi

摘要

Objective

Screen-based sedentary behavior (SB) is associated with elevated BMI; however, the underlying mechanisms remain poorly understood. This study investigates the mediating role of weight concern in the SB-BMI relationship and examines how body image perception and gender moderate this mediation. By focusing on body image as a critical contextual factor, the study aims to inform targeted interventions for adolescent obesity and overweight.

Methods

In 2016, self-report questionnaires assessing screen-based SB, weight concern, and body image perception were collected from 508 Chinese adolescents (grades 7–9), yielding 438 valid responses (response rate: 86.22%). Path analysis and bootstrap procedures with bias-corrected 95% confidence intervals were used for data analysis.

Results

Screen-based SB was positively associated with weight concern (b = 1.115, p = 0.009) and BMI (b = 0.183, p < 0.001). The mediation analysis showed that weight concern partially mediated this relationship, with an indirect effect of 0.056 (95% CI = [0.006, 0.114]). This mediation was moderated by body image perception and gender. Specifically, the interaction between BMI overestimation and weight concern was negatively associated with BMI (b=-0.157, p = 0.011), whereas the three-way interaction of gender, weight concern, and overestimated body image perception showed a positive association with BMI (b = 0.080, p = 0.025).

Conclusions

Screen-based SB influences BMI, with weight concern as a mediator and body image perception and gender as moderators. These findings highlight the importance of targeting sedentary behavior and body image concerns in gender-sensitive interventions for adolescents.