Outcomes
IVH
All outcomes were analyzed by blinded team researchers who did not know the code of the intervention. The primary outcome was preterm infants received RBC transfusions within 28 days of age. RBC transfusion was given 10–15 ml/kg for preterm infants who had one of these 3 conditions: I. infants requiring mechanical ventilation with mean airway pressure ≥ 8 cmHNeonatal outcomes such as IVH (using grading system proposed by Papile et al. [