4.7 Article

How do peers influence BMI? Evidence from randomly assigned classrooms in South Korea

期刊

SOCIAL SCIENCE & MEDICINE
卷 197, 期 -, 页码 17-23

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.socscimed.2017.11.032

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Peer effects; Obesity; Overweight; Social contagion; Health; Adolescents

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Obesity among children is an important public health concern, and social networks may play a role in students' habits that increase the likelihood of being overweight. We examine data from South Korean middle schools, where students are randomly assigned to classrooms, and exploit the variation in peer body mass index. We use the number of peers' siblings as an instrument to account for endogeneity concerns and measurement error. Heavier peers increase the likelihood that a student is heavier; there is no spurious correlation for height, which is unlikely to have peer contagion. Public policy that targets obesity can have spillovers through social networks.

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