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It is very uncertain whether synbiotics changes adverse events compared with prebiotics (very low certainty).
It is very uncertain whether synbiotics changes serious adverse events compared with prebiotics (very low certainty).
Mask may leads to lower treatment failure compared with prongs (low certainty).
Mask showed no clear difference in all‐cause mortality compared with prongs (low certainty).
The review found no eligible studies for this question.
Mask showed no clear difference in pneumothorax compared with prongs (low certainty).
Mask may leads to lower moderate–severe nasal injury compared with prongs (low certainty).
It is very uncertain whether mask changes bronchopulmonary dysplasia compared with prongs (very low certainty).
Zinc supplementation showed no clear difference in stillbirth compared with no zinc (with or without placebo) (low certainty).
It is very uncertain whether zinc supplementation changes neonatal death compared with no zinc (with or without placebo) (very low certainty).
Zinc supplementation showed no clear difference in perinatal death compared with no zinc (with or without placebo) (low certainty).
Zinc supplementation showed no clear difference in small‐for‐gestational age or IUGR compared with no zinc (with or without placebo) (moderate certainty).
Zinc supplementation showed no clear difference in low Birthweight (< 2500 g) compared with no zinc (with or without placebo) (moderate certainty).
Systemic corticosteroids (dexamethasone or hydrocortisone) leads to lower mortality at latest reported age compared with control (placebo or nothing) (high certainty).
Systemic corticosteroids (dexamethasone or hydrocortisone) probably leads to lower BPD at 36 weeks' PMA compared with control (placebo or nothing) (moderate certainty).
Systemic corticosteroids (dexamethasone or hydrocortisone) probably leads to lower mortality or BPD at 36 weeks' PMA compared with control (placebo or nothing) (moderate certainty).
Systemic corticosteroids (dexamethasone or hydrocortisone) showed no clear difference in cerebral palsy ‐ at latest reported age compared with control (placebo or nothing) (high certainty).
Systemic corticosteroids (dexamethasone or hydrocortisone) showed no clear difference in mortality or cerebral palsy ‐ at latest reported age compared with control (placebo or nothing) (high certainty).