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. 2020 Mar 25;48(2):0300060520903209. doi: 10.1177/0300060520903209

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© The Author(s) 2020

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 9. — Effects on complications in patients with respiratory failure in the helmet and control subgroups using a fixed-effects analysis, with a forest plot showing the risk ratio for helmet versus control. Squares and horizontal lines indicate the risk ratio and 95% CIs for each trial; the size of each square is proportional to the statistical weight of the trial in the meta-analysis. Diamonds indicate the estimated effect derived from the meta-analysis, with the centre indicating the point estimate and the left and right points indicating 95% CIs. CI, confidence interval.