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. 2016 Jan 28;16:24. doi: 10.1186/s12872-016-0202-x

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© Lin et al. 2016

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. 2 — Subgroup analysis of patients in different comorbidity subgroups. CHADS₂ = congestive heart failure, hypertension, age > 75 years, diabetes mellitus and previous stroke; CHF = congestive heart failure; CI = confidence interval; COPD = chronic obstructive pulmonary disease; DM = diabetes mellitus; HTN = hypertension; OR = odds ratio