Table 4.

Results of the meta-analysis of relative risk of severe asthma exacerbation.

Study	Sample size	Relative-Risk	95% CI	Weight (%)
				Fixed	Random
Backer 2018	2539	0.27	0.24–0.31	51.4	21.5
Park 2019	85	0.54	0.3–0.99	2.4	18.7
Schmidt 2017	1410	0.14	0.12–0.18	18.1	21.2
Wan 2017	618	0.85	0.71–1.02	26.8	21.4
Usmani 2017	151	0.18	0.09–0.40	1.4	17.2
Total (fixed effects)	4803	0.33	0.30–0.37	100.0	100.0
Total (random effects)	4803	0.32	0.16–0.66	100.0	100.0