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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 3. — Controlling for LTL_b increases the probability of false-positive errors when there is a difference in LTL_b. Probability of a type 1 error as a function of measurement error (CV) for the four models under consideration. Data points represent the proportion of simulations yielding a p-value below 0.05 in 1000 replicate simulations. The left and right panels show the probability of type 1 errors in scenarios A and C, respectively. The difference in LTL_b between smokers and non-smokers in scenario C was LTL_b 141 bp shorter in smokers.