Non-anemic iron deficiency predicts prolonged hospitalisation following surgical aortic valve replacement: a single-centre retrospective study

Table 4 Incidence of perioperative red blood cell transfusion

		Patients transfused at least one unit of red cells, n (%)
		All patients	Non-anemic	Anemic
sTfR	ID	12 (22%)	4 (13%)	8 (35%)
	IR	30 (15%)	22 (13%)	8 (33%)
Relative risk (CI) for transfusion with ID		1.4^NS (0.8, 2.6)	1.0^NS (0.4, 2.6)	1.0^NS (0.5, 2.3)
Ferritin	ID	24 (16%)	14 (12%)	10 (28%)
	IR	18 (18%)	12 (13%)	6 (55%)
Relative risk (CI) for transfusion with ID		0.9^NS (0.5,1.6)	0.9^NS (0.5,1.9)	0.5^NS (0.2,1.1)

The relative risks and 95% confidence intervals (CI) for transfusion are given in the entire cohort as well as according to the presence of absence of anemia, using the two definitions of ID. Where the CI for the relative risk includes 1 the difference is marked as NS (non-significant)

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