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. 2021 Nov 29;84(3):418–467. doi: 10.1016/j.jinf.2021.11.021

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© 2021 The British Infection Association. Published by Elsevier Ltd. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig 1 — (A) Forest plot indicated that coronavirus disease 2019 (COVID-19) patients with asthma had a significantly increased risk for admission to intensive care unit (ICU) compared to those without asthma: pooled risk ratio (RR) with its 95% confidence intervals (CI); (B) Sensitivity analysis for pooled RR and 95% CI by deleting one single study from overall pooled analysis each time showed that our results were robust.