Comparison 3. Adverse events.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Treatment failure (intractable hypoxia, hypotension, acidosis, hypercapnoea requiring discontinuation of study intervention)	6	956	Risk Ratio (M‐H, Random, 95% CI)	0.64 [0.48, 0.85]
2 Barotrauma	7	951	Risk Ratio (M‐H, Random, 95% CI)	0.82 [0.51, 1.32]
3 Hypotension	4	392	Risk Ratio (M‐H, Random, 95% CI)	1.02 [0.54, 1.90]
4 Hypotension (Shah included)	5	420	Risk Ratio (M‐H, Random, 95% CI)	1.01 [0.61, 1.66]
5 ETT obstruction	4		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected