Study	Reason for exclusion
Atilgan 2019	Active multi‐component intervention. Included oropharyngeal exercises and breathing exercises. Not possible to differentiate the separate effect of oropharyngeal exercises.
Bague 2014	Active multi‐component intervention. Included oropharyngeal exercises, pulmonary exercises, electrical stimulation and manual therapy. Not possible to differentiate the separate effect of oropharyngeal exercises.
Kaur 2019	Active multi‐component intervention. Included oropharyngeal exercises plus pranayama. Not possible to differentiate the separate effect of oropharyngeal exercises.
Kim 2019	Myofunctional therapy support program based on self‐efficacy theory compared to no support during myofunctional therapy.
Kittivoravitkul 2018	Active multi‐component intervention. Included oropharyngeal exercises plus incentive spirometry. Not possible to differentiate the separate effect of oropharyngeal exercises.
Neumannova 2018	Active multi‐component intervention. Included oropharyngeal exercises, breathing retraining, respiratory muscle training with physiotherapist. Not possible to differentiate the separate effect of oropharyngeal exercises.
O’Connor‐Reina 2018	Compares two different ways of receiving myofunctional therapy: an app versus diagrams and videos.
Torres‐Castro 2016	Active multi‐component intervention. Included oropharyngeal exercises, urban walking program, diet and sleep recommendations. Not possible to differentiate the separate effect of oropharyngeal exercises.
Villa 2017	The study does not evaluate any of the outcomes relevant for this review.
Ye 2018	All participants with post‐stroke obstructive sleep apnoea syndrome.