The lack of access to public transport is generally considered to be a risk factor for childhood obesity by discouraging active transport and thus physical activity. To explore the association between access to public transport and childhood obesity, we have conducted a systematic literature search in the Cochrane Library, PubMed, and Web of Science for studies published before January 1, 2019. A total of 25 cross-sectional and two longitudinal studies conducted in 10 countries were identified. Inconsistent findings were identified arising from a great variety of sample characteristics, definitions of exposure (ie, access to public transport), and outcome variables (eg, obesity), and analysis methods. While over half of the studies showed null associations between access to public transport and childhood obesity, we have observed more positive than negative associations among the rest of the studies. These observations suggest that an increased level of access to public transport may have a health-promoting effect and hence prevent the development of childhood obesity. However, this conclusion needs to be further corroborated in future research on the basis of large-sample health surveys, in situ observations, and comparative analyses among different study areas.

中文翻译：

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使用公共交通和儿童肥胖症：系统评价。

缺乏公共交通工具通常被认为是儿童肥胖的一个危险因素，因为阻碍了积极的交通，从而阻碍了身体活动。为了探索公共交通与儿童肥胖之间的关联，我们在 Cochrane 图书馆、PubMed 和科学网络中对 2019 年 1 月 1 日之前发表的研究进行了系统的文献检索。总共 25 个横断面和两个纵向确定了在 10 个国家进行的研究。由于大量样本特征、暴露的定义（即，乘坐公共交通工具）和结果变量（例如，肥胖）和分析方法，发现了不一致的结果。虽然超过一半的研究表明乘坐公共交通工具与儿童肥胖之间没有关联，在其余研究中，我们观察到更多的正相关而不是负相关。这些观察结果表明，增加公共交通的使用水平可能具有促进健康的作用，从而防止儿童肥胖的发展。但这一结论还需在未来大样本健康调查、原位观察和不同研究区域对比分析的基础上进一步证实。