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. 2014 Jun 26;14:82. doi: 10.1186/1471-2288-14-82

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Copyright © 2014 Chen et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Relative bias (%) in log scale (n = 1500). A. Association between Z and Y: Linear; Level of association between Z and X, Z and Y: Moderate. B. Association between Z and Y: Linear; Level of association between Z and X, Z and Y: Strong. C. Association between Z and Y: Non-Linear; Level of association between Z and X, Z and Y: Moderate. D. Association between Z and Y: Non-Linear; Level of association between Z and X, Z and Y: Strong. Robust Poisson: Red dotted lines. Log-Binomial: Blue solid lines.