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. 2014 Nov 26;9(11):e113048. doi: 10.1371/journal.pone.0113048

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© 2014 Du et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Three subgroups were analysis according to the comorbid conditions of COPD. This Forest plot represents the relative risk (RR) (95% confidence interval) for mortality in COPD patients treated with beta-blockers compared with controls. (see also weight values on the right).