Longer storage duration of red blood cells is associated with an increased risk of acute lung injury in patients with sepsis

Annals of Intensive Care

Table 4 Baseline characteristics of the trauma cohort

Characteristic	ALI/ARDS	No ALI/ARDS	p value
	(n = 80)	(n = 96)
Age (yr)	51 (36, 63)	46 (29, 59)	0.094^a
Female gender	28.8% (23)	24.0% (23)	0.471^b
Current smoker	46.3% (31)	46.5% (40)	0.976^b
ICU days	12 (7, 16)	8 (5, 13)	0.014^a
Ventilator-free days	17 ( 12, 22)	21 (16, 24)	<0.001^a
Hospital days	16 (11, 24)	15 (10, 23)	0.281^a
Baseline APACHE II score	27 (24, 31)	26 (22, 30)	0.035^a
Baseline ISS score	34 (29, 41)	28 (19, 37)	0.011^a
Blood median storage days	20 (14, 26)	20 (14, 27)	0.651^a
Blood maximum storage days	25 (19, 32)	25 (19, 31)	0.583^a
Number of units transfused	4 (2, 6)	4 (2, 9)	0.465^a

Data given as median (25^th percentile, 75^th percentile) or percent (frequency) of patients.
^aWilcoxon test; ^bPearson test.