Perrin 2007.

Methods	RCT January 2001 ‐ January 2004
Participants	32 patients Patients with preoperative FEV1< 70% of the predicted value and scheduled for elective lobectomy related to lung cancer
Interventions	Intervention: NIPPV (bi‐level mode) 1 hour per day + bronchodilators + oral ambroxol + chest physiotherapy Control: Bronchodilatators + oral ambroxol + chest physiotherapy
Outcomes	Pulmonary complication rate (atelectasis) Mortality Length of hospital stay Adverse effects related to NIPPV Arterial blood gases Pulmonary function (FVC and FEV1)
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Sealed envelopes with the order of distribution determined by computer generated random numbers
Allocation concealment (selection bias)	Low risk	Sealed envelopes
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Outcome data were objective
Incomplete outcome data (attrition bias) All outcomes	Low risk	Losses: 7. Reasons for exclusion after randomisation were described
Selective reporting (reporting bias)	Low risk	No evidence of selective reporting
Other bias	Low risk	No evidence of other bias