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. 2016 Jul 12;15:75. doi: 10.1186/s12940-016-0160-x

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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. 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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Fig. 1 — Linear regression for the ERF from three exposure groups in the KARUPROSTE study. ERFs calculated with equation 1 for each exposure group in the KARUPROSTATE study are plotted as squares. Dashed line is the “best” regression (best R²) between delta exposure and delta risk (Power function: y = 0.2685x^0.5664, R² = 0.9919). The thick line is the linear regression (equation and R² values shown to the left). The thin line is the graphical representation of the final ERF (equation and R² values shown to the right) derived from the first exposure group that significantly differs from the reference group, i.e. the highest exposed group