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Forrest plot of COVID-19 patients divided into CAPA versus non-CAPA. Clinical characteristics and risk factors of male, COPD, diabetes, cancer, long-term corticosteroid treatment and immunosuppressants were assessed. The odds ratio was calculated by the Mantel–Haenszel method with a random-effects model. CI confidence intervals, COPD chronic obstructive pulmonary disease, df degree of freedom, M–H Mantel–Haenszel
