Table II.

Univariable associations of anaemia with transfusion, of race with transfusion, and of race with anaemia, with listwise deletion for missing data

Database	Anaemia	n	Transfusion	OR (95% CI)	p
UHS	Yes	5,812	100 (1.7%)	5.79 (4.58–7.32)	<0.0001
	No	81,653	246 (0.3%)
	Black
	Yes	10,218	61 (0.6%)	1.62 (1.23–2.14)	0.001
	No	77,247	285 (0.4%)
	Black		Anaemia
	Yes	10,218	1,397 (13.7%)	2.61 (2.45–2.79)	<0.0001
	No	77,247	4415 (5.7%)
CSL	Anaemia	n	Transfusion	OR (95% CI)	p
	Yes	18,153	868 (4.8%)	1.27 (1.18–1.37)	<0.0001
	No	122,171	4,638 (3.8%)
	Black
	Yes	33,466	694 (2.1%)	0.44 (0.41–0.49)	<0.0001
	No	106,858	4,812 (4.5%)
	Black		Anaemia
	Yes	33,466	5,524 (16.5%)	1.48 (1.43–1.53)	<0.0001
	No	106,858	12,629 (11.8%)
CR	Anaemia	n	Transfusion	OR (95% CI)	p
	Yes	4,751	518 (10.9%)	6.46 (5.78–7.22)	<0.0001
	No	52,213	970 (1.9%)
	Black
	Yes	15,845	609 (3.8%)	1.83 (1.65–2.03)	<0.0001
	No	41,119	879 (2.1%)
	Black		Anaemia
	Yes	15,845	2,236 (14.1%)	2.52 (2.37–2.68)	<0.0001
	No	41,119	2,515 (6.1%)

Transfusion and anaemia data are n (%).