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. 2015 Dec 28;15:107. doi: 10.1186/s12874-015-0096-9

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© Dunning et al. 2015

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 — Scaled logit model fitted to the White/varicella data [23]. Left panel: Bars show the number and proportion of subjects who developed disease in each interval of assay value; curve is estimated probability of disease. Right panel: Estimated protection curve with 95 % confidence interval for protection and estimates of assay values at which protection is 50 % and 90 %