Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Atlanta, GA 30345, USA.
Pediatrics. 2010 Jul;126(1):e89-96. doi: 10.1542/peds.2009-3374. Epub 2010 Jun 14.
To examine the associations of demographics, rules associated with television-viewing, and physical activity with daily screen time (including television, non-school-related computer use, and video games) in children and adolescents.
We analyzed data from a telephone survey of 7415 youth aged 9 to 15 years from the Youth Media Campaign Longitudinal Survey. We used logistic regression models to calculate odds of exceeding recommended screen-time limits (>120 minutes/day) according to demographics, rules, and physical activity.
Odds that children would exceed recommended screen-time limits were positively associated with age and black race/ethnicity and negatively associated with income level. Children and adolescents who reported that they really agreed that their parents had rules about time spent watching television and playing video games were less likely to exceed recommended limits than those who strongly disagreed that their parents had rules. Similarly, when parents reported always or very often having limits on television watching (versus rarely or never) and when parents correctly identified the recommended limits, children were less likely to exceed recommended limits. Children whose parents reported consistent limits and who themselves reported consistent rules about time spent watching television had the lowest prevalence of exceeding recommended limits. Odds that children would exceed recommended limits decreased as physical activity in the previous week increased.
Parental rules regarding screen time and participation in physical activity play a role in the amount of screen time among children and adolescents. Programs that encourage limit-setting by parents and promote physical activity may reduce screen time among youth.
研究人口统计学因素、与看电视相关的规则以及身体活动与儿童和青少年每日屏幕时间（包括电视、非学校相关的计算机使用和视频游戏）之间的关系。
我们分析了来自青少年媒体活动纵向调查的一项针对 7415 名 9 至 15 岁儿童的电话调查数据。我们使用逻辑回归模型根据人口统计学因素、规则和身体活动来计算超过推荐屏幕时间限制（>120 分钟/天）的几率。
儿童超过推荐屏幕时间限制的几率与年龄和黑人和少数民族呈正相关，与收入水平呈负相关。报告父母确实有关于看电视和玩视频游戏时间规定的儿童和青少年，比强烈不同意父母有规定的儿童和青少年更不可能超过推荐的限制。同样，当父母报告总是或经常限制看电视（而不是很少或从不限制）并且父母正确识别推荐的限制时，儿童也不太可能超过推荐的限制。父母报告有一致的限制且自己报告对看电视时间有一致规定的儿童，超过推荐限制的比例最低。随着上周身体活动的增加，儿童超过推荐限制的几率降低。
父母关于屏幕时间的规定和参与身体活动在儿童和青少年的屏幕时间方面起着重要作用。鼓励父母设定限制并促进身体活动的计划可能会减少青少年的屏幕时间。
