Lin 2011.

Methods	Randomised controlled trial in China.
Participants	Inclusion criteria: sick term and preterm newborns with stress ulcer day 1 to 8 age (n = 152). Exclusion criteria: none reported.
Interventions	Intervention (n = 76): conventional therapy combined with omeprazole 0.6 mg/kg intragastric once daily for 5 days. Control (n = 76): conventional therapy. Both groups nil by mouth, stomach washed with bicarbonate.
Outcomes	Efficacy ‒ gastric aspirate bleed and melena to 48 hours. Bleeding after 48 hours no benefit.
Notes	It is unclear if there were any adverse reactions attributable to the intervention.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Reported: "randomly divided".
Allocation concealment (selection bias)	Unclear risk	Method not reported.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not reported.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not reported.
Incomplete outcome data (attrition bias) All outcomes	Low risk	No losses reported.
Selective reporting (reporting bias)	Unclear risk	No protocol available.
Other bias	Low risk	Similar baseline characteristics between groups.