2.4 Data extraction:
Two authors (SSR, AMF, VDPG) independently performed data extraction
from included studied, which was then cross-checked by the third author
(AK) to reduce errors. From each included study, the following details
were retrieved, the first author’s name, the origin country of the
analysis, study design, number of COVID-19 patients, median age, gender
(female sex proportion), patients with NOAF, data on patients with
pre-existing atrial fibrillation if available, ICU admitted patients or
patients with respiratory failure, and all-cause mortality. Criteria for
severe disease was ICU admission or respiratory failure.