Table 2.

Univariate and multivariate predictors of nosocomial infection.

Factor	Univariate OR (95% CI)	p	Multivariate OR (95 CI)	p
Mean PRBC donor age	1.03 (1.00–1.05)	*0.047	1.03 (1.00–1.05)	0.074
Minimum PRBC donor age	1.01 (0.99–1.04)	0.267
Maximum PRBC donor age	1.02 (1.00–1.03)	*0.035	collinear to total transfusions
Mean PRBC storage duration	0.99 (0.96–1.03)	0.693
Minimum PRBC storage duration	0.99 (0.96–1.01)	0.317
Maximum PRBC storage duration	1.02 (0.99–1.04)	0.171
Total PRBCs transfused	1.12 (1.04–1.19)	*0.001	collinear to hemorrhagic shock
within 24 hours	1.06 (0.97–1.17)	0.202
after 24 hours	1.18 (1.07–1.30)	*0.001	1.17 (1.06–1.29)	*0.003
Injury Severity Score	1.03 (1.01–1.06)	*0.004	1.03 (1.01–1.06)	*0.013
Hemorrhagic shock#	1.80 (1.09–3.13)	*0.023	2.12 (1.13–4.00)	*0.020

OR: odds ratio, CI: confidence interval, PRBC: packed red blood cell,

^#systolic blood pressure < 90 mmHg or lactic acid ≥ 4 mmol/L on admission