Results:
Literature search
A diagram of study selection is presented in figure 1. In primary search, 5834 papers were obtained evaluating the respiratory function and symptoms subsequent to COVID-19 in children. During screening process, some studies were excluded because they were review article or case series. Some studies were excluded because they studied adults, or evaluated respiratory function and symptoms during COVID-19 infection. Some studies were excluded because of duplication. Finally, seven articles including 345 patients were enrolled in the present review (13-18). Eligible studies were including 5 cross sectionals (13, 14, 16, 17, 19) and 2 longitudinal studies (15, 18). In one study the z score of spirometry parameters were reported. It only included in systematic review (16). Details of eligible studies are presented in table 1. Cohen’s kappa statistic for interrater agreement in data selection and extraction was 0.98, p value<0.0001.