Table 3:

Effect of storage duration on hemoglobin increments after RBC transfusion

Storage Duration	Number of RBC units	No Adjustment	Adjustment for age, sex, and BMI	Adjustment for pre-TX Hb*
		Estimated mean hemoglobin increment (95% CI)
<21 days	9,363	0.79 (0.77, 0.81)	0.88 (0.86, 0.90)	1.05 (1.02, 1.07)
22–28	11,245	0.81 (0.79, 0.83)	0.89 (0.87, 0.91)	1.04 (1.01, 1.05)
29–35	7,876	0.86 (0.84, 0.88)	0.92 (0.90, 0.94)	1.04 (1.01, 1.06)
36–42	7,063	0.91 (0.89, 0.94)	0.94 (0.92, 0.96)	1.00 (0.98, 1.02)

RBC=red blood cell; BMI=body mass index; TX=transfusion; Hb=hemoglobin

^*p-value <0.02 for mean estimated hemoglobin increment of >35-day stored RBCs vs. all other storage periods