Extremely preterm

Very Preterm

Late preterm

p-value

Total

Mean ± SD

Pre-transfusion Hb

9.06 ± 2.07

9.83 ± 2.06

10.05 ± 2.07

0.017

9.75 ± 2.09

Volume of blood (mL/kg) transfused

16.5 ± 3.85

16.74 ± 4.3

14.14 ± 3.52

<0.001

15.61 ± 4.09

Number of transfusions (mean number)

5.61 ± 2.38

3.43 ± 1.94

2.64 ± 1.37

<0.001

3.59 ± 2.38

Day of life of transfusion

15.09 ± 14.8

19.14 ± 14.5

14.36 ± 9.8

0.031

16.22 ± 13