Journal article
An Actor-Based Model of Social Network Influence on Adolescent Body Size, Screen Time, and Playing Sports
PloS one, v 7(6), pp e39795-e39795
29 Jun 2012
PMID: 22768124
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Recent studies suggest that obesity may be “contagious” between individuals in social networks. Social contagion (influence), however, may not be identifiable using traditional statistical approaches because they cannot distinguish contagion from homophily (the propensity for individuals to select friends who are similar to themselves) or from shared environmental influences. In this paper, we apply the stochastic actor-based model (SABM) framework developed by Snijders and colleagues to data on adolescent body mass index (BMI), screen time, and playing active sports. Our primary hypothesis was that social influences on adolescent body size and related behaviors are independent of friend selection. Employing the SABM, we simultaneously modeled network dynamics (friendship selection based on homophily and structural characteristics of the network) and social influence. We focused on the 2 largest schools in the National Longitudinal Study of Adolescent Health (Add Health) and held the school environment constant by examining the 2 school networks separately (N = 624 and 1151). Results show support in both schools for homophily on BMI, but also for social influence on BMI. There was no evidence of homophily on screen time in either school, while only one of the schools showed homophily on playing active sports. There was, however, evidence of social influence on screen time in one of the schools, and playing active sports in both schools. These results suggest that both homophily and social influence are important in understanding patterns of adolescent obesity. Intervention efforts should take into consideration peers’ influence on one another, rather than treating “high risk” adolescents in isolation.
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Details
- Title
- An Actor-Based Model of Social Network Influence on Adolescent Body Size, Screen Time, and Playing Sports
- Creators
- David A ShohamLiping TongPeter J LambersonAmy H AuchinclossJun ZhangLara DugasJay S KaufmanRichard S CooperAmy Luke
- Publication Details
- PloS one, v 7(6), pp e39795-e39795
- Publisher
- Public Library of Science; San Francisco, USA
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Epidemiology and Biostatistics
- Web of Science ID
- WOS:000305892100094
- Scopus ID
- 2-s2.0-84863083786
- Other Identifier
- 991014878339804721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Public, Environmental & Occupational Health