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. 2016 Oct 21;9:558. doi: 10.1186/s13071-016-1843-4

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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. 2 — Bland-Altman plots comparing the ELISA tests. Dashed blue lines indicate the confidence interval limits for the agreement limits (± 1.96*standard deviation); dashed red lines indicate the confidence interval limits for the mean bias difference. a Comparison of results for ELISA A and ELISA B: differences tended to increase with increasing mean % OD values. b Comparison of results for ELISA A and ELISA C: differences tended to decrease with increasing mean % OD values. c Comparison of results for ELISA B and ELISA C: differences decreased with increasing mean % OD values