Comparison 3. Voice‐enabling communication aid versus usual care with an aid.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
3.1 Ability to phonate	2	50	Risk Ratio (M‐H, Random, 95% CI)	3.03 [0.18, 50.08]
3.2 Speech intelligibility	1	20	Mean Difference (IV, Random, 95% CI)	Not estimable
3.3 Quality of life	2	63	Mean Difference (IV, Random, 95% CI)	2.27 [‐7.21, 11.75]
3.4 Intensive care unit length of stay	3	100	Mean Difference (IV, Random, 95% CI)	0.20 [‐0.04, 0.44]