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. 2020 Feb 7;8:15. doi: 10.1186/s40560-020-0432-y

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© The Author(s). 2020

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. 3 — Effect of vitamin C on the duration of ventilation. The horizontal lines indicate the 95% CI for the vitamin C effect and the blue squares in the middle of the horizontal lines indicate the point estimate of the effect in the particular trial. The red diamond shape indicates the pooled effect and its 95% CI. The Sadeghpour trial [19] is not included in the meta-analysis, since the dropout rate was high (42%) [1]. RoM ratio of means [22]