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. 2018 Sep 17;48(4):382–390. doi: 10.1177/1403494818799613

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© Author(s) 2018

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Population, households and study sample for the Lolland-Falster Health Study. Randomly selected households are randomly allocated to either the invitation group (in grey) or the control group (in white) in a 2:1 ratio.