Cindea 2011.

Methods	RCT Approved by the ethics committee and written informed consent obtained Setting: Romania Funding: unspecified
Participants	78 ASA 2 to 3 elderly patients (> 75 years) with good mental status, scheduled for major abdominal surgery under general anaesthesia
Interventions	Treatment group: PCEA with 0.1% ropivacaine and 5 mcg/mL of fentanyl (n = 39). Taken as 72 hours, as participants were followed during this time Control group: IV PCA with morphine (n = 39)
Outcomes	Time to first faeces ("return of gastrointestinal function")
Notes	Conference abstract
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	"randomly allocated", no details
Allocation concealment (selection bias)	Unclear risk	Not mentioned
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not mentioned
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not mentioned
Incomplete outcome data (attrition bias) All outcomes	Low risk	No loss to follow‐up mentioned
Selective reporting (reporting bias)	Low risk	All results reported
Other bias	Unclear risk	No details