Data extraction
Two independent researchers (EB and NM) extracted data from eligible
studies. A data collection sheet was used for data extraction. A third
author (SGh) judged disagreement between EB and NM. Data from each study
were including: author’s name, year of publication, county of study,
study design, number of studied patients, age range of children,
interval between COVID 19 and pulmonary function assessment, mean±
standard deviation (SD) of spirometry parameters and frequency of
respiratory symptoms.