Author who extracted data?	CI/TC/MZ	Date:
Article	MEDLINE ID	Language
Authors	Year of publication	Volume/No.	Pages
Include?	Yes/No
Reasons for exclusion
Need further details
Study type	RCT	CCT
Intervention group	No.	Duration	Sex
Nature of CPAP	Duration of CPAP	Weight/BMI
Control group	No.	Duration	Sex
Nature of control	Duration of control	Weight/BMI
Randomization	Intervention	Control	Bias level
Concealment of allocation	Intervention	Control	Bias level
Blinding	Intervention	Control	Bias level
Dropouts	Intervention	Control	Bias level
Outcome details	Intervention	Control	Bias level
Reporting			Bias level
Overall risk of bias			Bias level
Mortality	Intervention	Control
Major respiratory complications: (significant atelectasis, pneumonia, significant hypoxia, tracheal reintubation, ICU admission)	Intervention	Control
Length of hospital stay	Intervention	Control
Cardiovascular complications: (myocardial infarction, unstable angina, acute cardiac failure, arrhythmia)	Intervention	Control
Other postoperative complications: (wound infection, anastomotic leak, renal failure)	Intervention	Control
Adverse effects of the intervention: (pulmonary aspiration, upper airway or facial injury)	Intervention	Control