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. 2019 Sep 2;20:346. doi: 10.1186/s12882-019-1541-5

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© The Author(s). 2019

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. 2 — Detectable effect size versus sample size. Depicted is the relationship between number of samples in the study and minimal detectable difference in population means for standard deviations of 0.05 (red), 0.1 (blue) and 0.15 (pink). SD: Standard deviation