Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
Systematic review	83 people Data from 1 RCT	Overall withdrawal 5/31 (16%) with bi-level positive airway pressure 16/52 (31%) with CPAP	P = 0.05 See further information on studies for methodological weaknesses	Effect size not calculated	bi-level positive airway pressure
Systematic review	83 people Data from 1 RCT	Withdrawals caused by mask discomfort or intolerance to treatment 0/31 (0%) with bi-level positive airway pressure 5/52 (10%) with CPAP	Significance not assessed See further information on studies for methodological weaknesses
Systematic review	83 people Data from 1 RCT	Overall adverse effects with bi-level positive airway pressure with CPAP Absolute results not reported	See further information on studies for methodological weaknesses
Systematic review	27 people Data from 1 RCT	Overall adverse effects with bi-level positive airway pressure with CPAP Absolute results not reported	See further information on studies for methodological weaknesses