Table III.

Association between anaemia and transfusion adjusted for race, and between race and transfusion adjusted for anaemia

Database	Transfusion incidence	Predictor	Model 1*		Model 2†	Model 3‡
			Adjusted OR (95% CI)	p	Interaction p	Adjusted OR (95% CI)	p
UHS	346 (0.4%)	Anaemia	5.61 (4.42–7.11)	<0.0001	0.06	4.99 (3.89–6.39)	<0.0001
		Black	1.26 (0.95–1.67)	0.11		1.19 (0.89–1.59)	0.24
CSL	5,506 (3.9%)	Anaemia	1.34 (1.24–1.44)	<0.0001	<0.0001	1.28 (1.17–1.40)	<0.0001
		Black	0.44 (0.41–0.48)	<0.0001		0.40 (0.36–0.44)	<0.0001
CR	1,488 (2.6%)	Anaemia	6.00 (5.35–6.72)	<0.0001	0.007	5.45 (4.81–6.18)	<0.0001
		Black	1.43 (1.29–1.60)	<0.0001		1.32 (1.16–1.50)	<0.0001

^*Adjusted for anaemia or race.

^†p-value for interaction of Black race and anaemia on transfusion.

^‡Adjusted for age, parity, insurance, smoking during pregnancy, BMI, mode of delivery.