Dilli 2015.

Study characteristics
Methods	RCT
Participants	200 very preterm or VLBW infants
Interventions	Probiotics (N = 100): Bifidobacterium lactis added to human milk or formula once daily for 8 weeks (or hospital discharge) Control (N= 100): maltodextrin powder placebo
Outcomes	NEC Death Infection Length of hospital stay
Notes	Turkey (5 centres: 2011 to 2014) Funding: not stated NB. This was a 4‐arm RCT‐ 2 other groups were prebiotic (N = 100) and synbiotic (n + 100)
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer‐generated
Allocation concealment (selection bias)	Low risk	Sealed opaque envelopes
Blinding (performance bias and detection bias) All outcomes	Low risk	Masked (placebo‐controlled)
Incomplete outcome data (attrition bias) All outcomes	Low risk	Complete
Selective reporting (reporting bias)	Low risk	Unlikely