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. 2019 Oct 30;6(10):190937. doi: 10.1098/rsos.190937

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© 2019 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 7. — Graphical illustration of the biasing effect of controlling for LTL_b in analyses of ΔLTL and LTL_fu. This figure is based on simulated data and exaggerates the true difference in LTL between smokers and non-smokers. See text for explanation.