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. 2017 Jan 17;17:8. doi: 10.1186/s12871-017-0300-z

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© The Author(s). 2017

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 — Individual response to intrathecal hyperbaric bupivacaine at corresponding dose. Unfilled square (□) represents an ineffective response to the corresponding dose of intrathecal bupivacaine for spinal anesthesia. Filled square (■) represents an effective response to the corresponding dose of intrathecal bupivacaine for spinal anesthesia. Solid line represents the ED50 (dashed lines represent the 95% confidence interval, CI) of intrathecal hyperbaric bupivacaine for caesarean delivery