Study	Reason for exclusion
Afrashi 2015	Non‐randomised trial of prone positioning in sleep apnoea
Barnes 2017	Systematic review
Benoist 2017	Compared positional therapy with oral appliance therapy
Braver 1995	Non‐randomised study and participants are asymptomatic snorers and not people with POSA
Cartwright 1991	Non‐randomised trial of tongue retaining device and posture alarm
Dieltjens 2015	Compared positional device and mandibular advancement device with positional device alone
Eijsvogel 2015	Compared 2 methods of positional intervention (position sensor with vibration and tennis ball technique)
Greer 2006	Non randomised trial of wedge under the knee for OSA
Ha 2014	Systematic review
Kurlak 1994	Non randomised trial of wedge under the knee for OSA
Magalang 2016	Available only as an abstract in conference proceedings
Skinner 2004a	Intervention was a shoulder‐head elevation pillow that does not satisfy the prespecified description of positional therapy in this review.
Skinner 2004b	Intervention was a cervicomandibular support device, not considered as a 'positional device'
Zaremba 2015	Participants were not individuals with OSA, but asymptomatic post partum women
Zuberi 2004	Non‐randomised study

OSA: obstructive sleep apnoea