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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. 5 — Effect of the combination of vitamins C and E on the duration of ventilation by the duration of ventilation in the control group. The diagonal line shows the meta-regression line based on the vitamin C alone trials from Fig. 4. The horizontal dashed line indicates the null effect. The results of the three trials [29–31] and their 95% CIs are shown. For calculations, see Additional file 2. RoM ratio of means [22]