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There are varying reports of the prevalence and effect of comorbid asthma in coronavirus disease-2019 (COVID-19) patients. We sought to conduct a meta-analysis comparing asthmatic and non-asthmatic patients to determine the clinical significance of preexisting asthma in COVID-19 patients. Online databases PubMed, ScienceDirect, Web of Science, and Scopus, were searched up to July 15, 2020, for papers comparing asthma  versus  non-asthma COVID-19 patients. According to prespecified inclusion criteria, this analysis included eleven retrospective studies with 107,983 COVID-19 patients. Subgroup analysis was performed based on age groups. The mean age of the patients was 59.9 years (95%CI = 51.9–67.9). Across studies, the prevalence of asthma was 11.2% (95%CI: 9.1%–13.3%) among COVID-19 patients who attended the hospitals. Asthma patients were more likely to be younger (SMD = −0.36, 95%CI = −0.61 to −0.10,  p  = 0.005), and obese (OR = 1.98, 95%CI = 1.54–2.55,  p  &lt; 0.001), there was no differential risk of hospitalization rate, ICU admission, or development of acute respiratory distress syndrome (ARDS) between asthmatic and non-asthmatic cohorts. However, asthmatic patients had increased risk of endotracheal intubation (RR = 1.27, 95%CI = 1.02–1.58,  p  = 0.030) especially patients aged &lt;50 years (RR = 6.68, 95%CI = 1.76–11.13,  p  = 0.009). Despite this result, asthmatic patients had better recovery with a higher liability of being discharged and were less likely to die (RR = 0.80, 95%CI = 0.65–0.97,  p  = 0.026). To our knowledge, our meta-analysis is the largest to shed light on preexisting asthma as a predictor of intubation in COVID-19, especially in young and obese patients. Identifying high-risk groups is crucial for designing more effective intervention plans and optimization of efficient resource allocation.

Asthma and COVID-19; different entities, same outcome: a meta-analysis of 107,983 patients