J Phys Act Health. 2018 Jun 1;15(6):448-456. doi: 10.1123/jpah.2017-0272. Epub 2018 Mar 23.
Screen-based media overuse has been related to harmful consequences especially among children and adolescents. Given their complex interrelationships, predictors of screen time (ST) should be analyzed simultaneously rather than individually to avoid incomplete conclusions.
Structural equation models were conducted to examine associations between media ST (television, video games, and computers) along with harmful consequences in adolescents' well-being, such as underweight and overweight, depression, and school failure. Predictors included individual (gender, age, and physical activity), family (structure and socioeconomic background), and substance use variables. We used the Health Behaviour in School-aged Children survey organized in 2014, including eighth- and ninth-grade students living in France (N = 3720).
Students reported spending 3 hours per day in front of each media. Spending more than 2 hours behind each of those 3 media was associated with lower life satisfaction, less physical activity, active school bullying, and grade repetition. Socioeconomic status was the most important predictor of ST, whereas regular substance uses showed modest associations.
The main implication of our findings is to sensitize parents and stakeholders about the limitation of ST, including their own use that adolescents are likely to mimic. Alternative measures such as off-line time should be encouraged.
过度使用屏幕媒体尤其会对儿童和青少年造成有害影响。鉴于它们之间复杂的相互关系，应该同时而不是单独分析屏幕时间（ST）的预测因素，以避免得出不完整的结论。
本研究采用结构方程模型，考察了青少年健康不良（如体重过轻和超重、抑郁和学业失败）与媒体 ST（电视、视频游戏和电脑）之间的关联。预测因素包括个体（性别、年龄和身体活动）、家庭（结构和社会经济背景）和物质使用变量。我们使用了 2014 年组织的“青少年健康行为调查”，该调查包括居住在法国的八年级和九年级学生（N=3720）。
学生报告每天花 3 小时在每种媒体前。每天花超过 2 小时在这 3 种媒体中的任何一种上，与生活满意度较低、身体活动较少、主动学校欺凌和留级有关。社会经济地位是 ST 的最重要预测因素，而定期使用物质的关联则较为适度。
我们研究结果的主要意义是让家长和利益相关者认识到限制 ST 的重要性，包括他们自己的使用，因为青少年很可能会模仿。应该鼓励使用离线时间等替代措施。
