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. 2018 May 11;18:68. doi: 10.1186/s12890-018-0621-9

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© The Author(s). 2018

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. 4 — Multivariate regression analysis investigating the impact of co-morbidities on the risk of asthma. Asthma population (2124 subjects) versus non-asthma population (31,362 subjects); OR [95% CI] = Odds Ratio [95% Confidence Interval]. The results presented are adjusted for age (18–34,35–49, ≥50 years), gender and country (Egypt, Kuwait, Saudi Arabia, Turkey, UAE)