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. 2016 Sep 21;16:123. doi: 10.1186/s12874-016-0223-2

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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 — Discrimination performance (measured by area under Receiver Operator Characteristic curve) of risk prediction models according to simulated predictor characteristics. The original risk prediction model was augmented with simulated predictors with prevalence from 5 to 40 % and odds ratios ranging from 1 to 16: a one added simulated predictor per model; b three added simulated predictors per model; c five added simulated predictors per model