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. 2016 May 12;62(1):53–62. doi: 10.1007/s00038-016-0830-z

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Average socio-economic status, smoking exposure and social homophily among friends, by school, International Survey of adolescents, 2013. B Belgium, F Finland, G Germany, I Italy, N The Netherlands, P Portugal. Symbols are proportional to the 1+ homophily score