Duration of red blood cell storage is associated with increased incidence of deep vein thrombosis and in hospital mortality in patients with traumatic injuries

Table 3 Relation of RBC storage age and outcomes for patients transfused 5 or more units of RBCs and matched for RBC amount between study groups

Outcome and maximum RBC age used to determine increased RBC age group	Patient number	Decreased RBC age	Increased RBC age	Absolute difference in outcome (%)	Pvalue
DVT*
≥ 14 days	50	12.0% (3/25)	32.0% (8/25)	20.0	0.09
≥ 21 days	159	17.1% (14/82)	31.2% (24/77)	14.1	0.04
≥ 28 days	183	16.7 (16/96)	34.5% (30/87)	17.8	0.006
Mortality
≥ 14 days	56	17.9% (5/28)	21.4 (6/28)	3.5	0.73
≥ 21 days	176	18.2% (16/88)	25.0% (22/88)	6.8	0.27
≥ 28 days	202	13.9% (14/101)	26.7% (27/101)	12.8	0.02

* see text for explanation of difference in patient numbers between number of patients analyzed for deep vein thrombosis (DVT) and mortality outcomes according to maximum red blood cell (RBC) age used to determine study groups.

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