Reissman 1995.

Methods	Randomised clinical trial, USA
Participants	161 hospitalised adults undergoing major abdominal surgery, at nutritional risk due to major surgery Male:Female = 77:84 Mean age = 53.5 years
Interventions	Experimental group: Early feeding group, clear liquid diet on 1st postoperative day, and advanced to a regular diet with 24 ‐ 48 hrs(n = 80) Control group: Regular feeding. Nothing by mouth until resolution of ileus(n = 81)
Outcomes	Vomiting, abdominal distention, length of ileus, tolerance of regular diet, length of hospitalisation, and complications
Study dates	November 1992 and April 1994
Notes	We could obtain no contact information for the authors.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not described
Allocation concealment (selection bias)	Unclear risk	Not described
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not described
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not described
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	The number of participants with incomplete data was not reported.
Selective reporting (reporting bias)	Low risk	All‐cause mortality and serious adverse events were reported.
For‐profit bias	Unclear risk	It was unclear how the trial was funded.
Other bias	Low risk	The trial appeared to be free of other components that could put it at risk of bias.