Comparison 3. Subgroup analysis ‐ children versus adults.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Artificial airway occlusion	15		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
1.1 Children	1	56	Risk Ratio (M‐H, Random, 95% CI)	0.64 [0.33, 1.26]
1.2 Adults	14	2115	Risk Ratio (M‐H, Random, 95% CI)	1.94 [0.65, 5.76]
2 All‐cause mortality	12		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
2.1 Children	1	56	Risk Ratio (M‐H, Random, 95% CI)	2.79 [0.62, 12.67]
2.2 Adults	11	1895	Risk Ratio (M‐H, Random, 95% CI)	1.02 [0.88, 1.19]