3. Sensitivity analysis for primary outcome functional communication depending on risk of bias.

Analysis 1.1: Inclusion of:	Analysis results
All studies	(SMD 0.17, 95% CI −0.20 to 0.55; 112 participants; 3 studies; I² = 0%)
All studies with proper allocation concealment	SMD 0.08, 95% CI −0.43 to 0.60; 58 participants; 1 study I² = 0%
All studies with blinded outcome assessors	SMD 0.17, 95% CI −0.20 to 0.55; 112 participants; 3 studies; I² = 0%
All studies with intention‐to‐treat analysis	SMD 0.20, 95% CI −0.24 to 0.63; 84 participants; 2 studies; I² = 0%

All studies with low risk of bias in the corresponding domains were included in this sensitivity analysis.