Zhu 2000.

Methods	Randomised clinical trial, China
Participants	98 hospitalised adults undergoing gastric operation, at nutritional risk due to having major surgery Male:Female = 60:38 Mean age = 47.8 years
Interventions	Experimental group: Enteral nutrition support. On the 1st day a half‐dose, 66.9 Kj/kg/day, dripping speed of 60 ‐ 100 ml/hr; increased on the 2nd day up to full dose, dripping speed of 120 ‐ 150 ml/hr through nasal‐jejunum tube for 7 days.(n = 48) Control group: Conventional infusion of 2494.4 Kj/day and without protein for 7 days after operation (n = 50)
Outcomes	Serum cytokine levels (IL‐2, IFN‐γ, IL‐2Rα, sIL‐2R)
Study dates	Not stated
Notes	We tried but failed to contact the authors were att by phone.
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	High risk	Not mentioned, but the trial compared fluid infusion with enteral nutrition, which can be judged as high risk of bias
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not described
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	The numbers and reasons for withdrawals and dropouts were not clearly stated or not stated at all.
Selective reporting (reporting bias)	Unclear risk	There is no protocol and the outcomes all‐cause mortality and serious adverse events are not reported on.
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.