Table 6.

Infectious complications analysis by model type.

Variable	Odds ratio	95% Confidence Interval
Mean PRBC age as a continuous variable	0.976	0.927 – 1.026
Number of transfused PRBC units	0.981	0.932 – 1.025
Patient age	1.013	0.990 – 1.038
ISS	1.043	1.013 – 1.077
Head AIS	1.087	0.864 – 1.361
Percentage of PRBC units <14 days old	0.992	0.979 – 1.006
Number of transfused PRBC units	0.981	0.933 – 1.024
Patient age	1.012	0.989 – 1.036
ISS	1.044	1.014 – 1.077
Head AIS	1.086	0.865 – 1.358
Percentage of PRBC units <21 days old	0.995	0.986 – 1.005
Number of transfused PRBC units	0.980	0.931 – 1.024
Patient age	1.013	0.990 – 1.038
ISS	1.043	1.013 – 1.077
Head AIS	1.092	0.867 – 1.368
PRBC age dichotomized at 14 days old	0.612	0.189 – 2.070
Number of transfused PRBC units	0.984	0.935 – 1.027
Patient age	1.012	0.989 – 1.036
ISS	1.043	1.013 – 1.076
Head AIS	1.076	0.855 – 1.345

ISS= Injury Severity Score; PRBC= Packed Red Blood Cell; AIS= Abbreviated Injury Score; MODS= Multiple Organ Dysfunction Score.