3.3 Asthma exacerbation
Three studies14,19,20 were included in this outcome, with 751 cases during COVID-19 pandemic, and 889 cases before COVID-19 pandemic. Heterogeneity test analysis suggested that there was heterogeneity (I2=60%, P=0.08), so the random effects model was used. The meta-analysis demonstrated there was no significant difference between two groups(OR =0.49, 95%CI= [0.20,1.16], Z=1.62, P=0.11)(Figure 2).