Fig 1.
PRISMA flow diagram of the study selection for the systematic review and meta-analysis.
Table 1.
Characteristics of the included studies.
Fig 2.
Forest plots of the effects of oral vitamin A supplementation in preterm infants.
(A) Duration of mechanical ventilation (days); (B) Duration of CPAP/HHFNC (days); (C) Duration of oxygen requirement (days); (D) Moderate-to-severe BPD at 36 weeks PMA; (E) Oxygen requirement at 36 weeks PMA; (F) Postnatal steroids needed.
Fig 3.
Forest plots of the effects of oral vitamin A supplementation in preterm infants and adverse effects.
(A) Death; (B) Duration of hospitalization (days); (C) Oxygen requirement at 28 days of age; (D) ROP requiring treatment; (E) Serum retinol concentration at 28 days of age (μg/dL); (F) Vomiting.
Table 2.
GRADE summary of findings: Effects of oral vitamin A supplementation on clinical outcomes in preterm infants.