2.2 Eligibility Criteria
All qualified studies were included in this meta-analysis. To be included in the present meta-analysis, the article must have full filled the following inclusion criteria: (a) an observational article reporting COVID-19 and prevalence of NOAF; (b) studies with a sample size of ≥ 5 patients. These studies were included irrespective of the patient’s age, gender, or ethnicity.
The following were the exclusion requirements: (a) lacking data on the outcome of COVID-19, (b) duplicate publications, (c) letters to the editor, case reports, commentaries, reviews, and posters.