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. 2011 Feb 2;15(1):R46. doi: 10.1186/cc10009

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Copyright ©2011 Goligher et al.; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Forest plot of meta-analysis of studies reporting change in oxygenation after pleural drainage. P_aO₂:F_iO₂ratios before and after thoracentesis analyzed by (a) relative mean difference (ratio of means) and (b) absolute mean difference.