Free video-sharing platforms such as YouTube are highly popular among young children but may contain low-quality and highly commercialized content. This study aimed to describe the prevalence, duration, and timing of objectively measured mobile YouTube viewing in preschool-aged children and test hypotheses about associations with child individual differences and contextual factors. We analyzed mobile sampling data from 349 English-speaking children aged 3–4.99 years whose parents completed surveys about child, parent, and household characteristics. We assessed whether the child ever viewed YouTube during the sampling week and calculated average daily duration in a subsample of 121 participants with their own mobile devices. We built multivariable logistic regression models to test correlates of mobile YouTube viewership and duration. Children were 3.82 years (SD 0.53), 74.6 percent white non-Hispanic; parents were mostly mothers (93.7 percent), 34.0 (SD 4.6) years, and 37.9 percent had less than a college degree. Mobile YouTube viewing (37.0 percent of children) was more likely in children who used Android devices, shared mobile devices with family members, were older, attended home-based childcare, or had parents with lower educational attainment. Median YouTube duration was 61.2 min/day, with longer durations in children whose parents had lower educational attainment. These results demonstrate that many young children use free video-sharing platforms on mobile devices for long durations, and this practice may be disproportionately higher in children from lower socioeconomic status. Longitudinal research is needed on video-sharing platform viewing and child outcomes.

中文翻译：

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学龄前儿童观看视频共享平台：儿童特征和情境因素的差异

YouTube 等免费视频共享平台在幼儿中非常受欢迎，但可能包含低质量和高度商业化的内容。本研究旨在描述客观测量的学龄前儿童移动 YouTube 观看的普遍性、持续时间和时间，并检验与儿童个体差异和背景因素相关的假设。我们分析了 349 名 3-4.99 岁的英语儿童的移动抽样数据，他们的父母完成了关于儿童、父母和家庭特征的调查。我们评估了孩子在抽样周内是否曾经观看过 YouTube，并计算了 121 名使用自己的移动设备的参与者的子样本的平均每日持续时间。我们建立了多变量逻辑回归模型来测试移动 YouTube 收视率和持续时间的相关性。SD 0.53)，74.6% 的白人非西班牙裔；父母大多是母亲 (93.7%)，34.0 ( SD4.6) 年，37.9% 的人大学学历以下。移动 YouTube 观看（占儿童的 37.0%）更有可能发生在使用 Android 设备、与家人共享移动设备、年龄较大、参加家庭托儿服务或父母受教育程度较低的儿童中。YouTube 持续时间中位数为 61.2 分钟/天，父母受教育程度较低的儿童的持续时间更长。这些结果表明，许多幼儿会长时间在移动设备上使用免费的视频共享平台，而且这种做法在社会经济地位较低的儿童中可能不成比例地高。需要对视频共享平台观看和儿童结果进行纵向研究。