Table 3 Unadjusted odds ratio of receiving RBC transfusions according to infant’s characteristics and neonatal unit

Gestational age (weeks)

0.731

0.713 – 0.750

<0.001

Birth weight < 1000 grams

5.418

4.714 – 6.228

<0.001

5^th minute Apgar <7

2.472

2.055 – 2.973

<0.001

SNAPPE II (score)

1.033

1.029 – 1.037

<0.001

Respiratory distress syndrome

4.049

3.541 – 4.630

<0.001

Apnea

2.419

2.135 – 2.740

<0.001

Patent ductus arteriosus

2.479

2.172 – 2.828

<0.001

Clinical sepsis

7.903

6.867 – 9.094

<0.001

Necrotizing enterocolitis

6.795

4.862 – 9.496

<0.001

PIVH grades 3-4

2.855

2.212 – 3.685

<0.001

Need for oxygen at 28 days of life

1.625

1.502 – 1.757

<0.001

Retinophaty of prematurity

2.003

1.705 – 2.353

<0.001

Use of umbilical catheter

2.910

2.555 – 3.314

<0.001

Need for mechanical ventilation

8.754

7.581 – 10.109

<0.001

Use of vasoactive drugs

2.868

2.304 – 3.570

<0.001

Need for parenteral nutrition

7.870

6.009 – 10.308

<0.001

Intra-hospital death

2.534

2.135 – 2.740

<0.001

Unit M

1.015

0.697 – 1.477

0.939

Unit A

1.341

0.883 – 2.036

0.169

Unit J

1.436

0.910 – 2.264

0.120

Unit B

1.563

1.146 – 2.133

0.005

Unit D

1.587

1.038 – 2.427

0.033

Unit I

1.918

1.324 – 2.778

0.001

Unit O

2.051

1.321 – 3.185

0.001

Unit E

2.176

1.518 – 3.118

<0.001

Unit P

2.208

1.495 – 3.263

<0.001

Unit G

2550

1.789 – 3.635

<0.001

Unit C

2.832

1.941 – 4.132

<0.001

Unit L

3.290

2.229 – 4.854

<0.001

Unit K

3.591

2.511 – 5.136

<0.001

Unit H

3.814

2.573 – 5.654

<0.001

Unit N

4.926

3.209 – 7.561

<0.001