3.6 Use of inhaled corticosteroids and Beta-2 agonists
The meta-analysis showed that there was no significant difference between two groups in the use of inhaled corticosteroids(OR=0.22, 95%CI= [0.03,1.85], Z=1.15, P=0.25)(Figure 5)and Beta-2 agonists(OR =0.18, 95%CI= [0.01,3.35], Z=1.39, P=0.16)(Figure 6).Heterogeneity test analysis suggested that there was heterogeneity in the two outcomes (I2=96%, P<0.00001 of use of inhaled corticosteroids and I2=97%, P<0.00001 of Beta-2 agonists), so the random effects model was used.