Jarvis 2006.

Methods	Randomised, cross‐over study. Statistical analysis methods unclear but paired data obtained via correspondence
Participants	N = 20 participants Inclusion criteria: diagnosed with OSA; established on CPAP therapy
Interventions	Modified APAP (bi‐level pressure mode) versus fixed CPAP Study duration: 2 x 2 weeks
Outcomes	Machine usage (average hours used) AHI Treatment pressure Preference
Funding & conflicts of interest statements	Resmed sponsored the study but no other details were available.
Notes	TJL emailed for confirmation of data and methods 5 September 2008. Reply from Resmed October 2008
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "The study was randomised by pulling the order of treatment received 'out of a hat'"
Allocation concealment (selection bias)	Low risk	Quote: "The person who pulled the order was a ResMed employee independent of the study and with no knowledge of the study."
Blinding of participants and personnel (performance bias) Machine usage, symptoms, quality of life, withdrawal, adverse effects	Unclear risk	Information not available
Blinding of participants and personnel (performance bias) AHI, blood pressure, treatment pressure	Low risk	These outcomes unlikely to be affected by awareness of treatment group.
Blinding of outcome assessment (detection bias) Machine usage, symptoms, quality of life, withdrawal, adverse effects	Unclear risk	Information not available
Blinding of outcome assessment (detection bias) AHI, blood pressure, treatment pressure	Low risk	These outcomes unlikely to be affected by awareness of treatment group.
Incomplete outcome data (attrition bias) All outcomes	Low risk	All completed
Selective reporting (reporting bias)	Low risk	All outcomes reported
Other bias	Low risk	No concerns identified