Comparison 1. Myofunctional therapy versus sham therapy.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 Daytime sleepiness (ESS): endpoint score. Follow‐up: 3 months	2	82	Mean Difference (IV, Random, 95% CI)	‐4.52 [‐6.67, ‐2.36]
1.2 Sleep quality (PSQI): endpoint score. Follow‐up: 3 months	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
1.3 AHI: endpoint score. Follow‐up: 3 months	2	82	Mean Difference (IV, Fixed, 95% CI)	‐13.20 [‐18.48, ‐7.93]
1.4 Snoring frequency (number of classified snores > 60 dBA per hour of sleep): change from baseline. Follow‐up: 3 months	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
1.5 Snoring frequency (subjective visual analogue scale): endpoint score. Follow‐up: 3 months	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
1.6 Snoring intensity: endpoint score. Follow‐up: 3 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected