Table 3.

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

	OR	95 % CI	p
Gestational age (weeks)	0.731	0.713 – 0.750	<0.001
Birth weight < 1000 grams	5.418	4.714 – 6.228	<0.001
5th 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

SNAPPE II Morbidity and mortality risk scores, PIVH peri-intraventricular hemorrhage