Annals of Intensive Care

Table 2 Unmatched baseline characteristics

From: Mortality and morbidity of low-grade red blood cell transfusions in septic patients: a propensity score-matched observational study of a liberal transfusion strategy

	Unmatched groups			Propensity-matched groups
	Controls, n = 405	RBC^a, n = 459	P-value^b	Controls, n = 237	RBC, n = 237	P value^c
SAPS 3^d, median (IQR^e)	66 (58–77)	71 (62–81)	< 0.001	69 (60–80)	69 (59–79)	N.S.
First SOFA^f	8 (5–10)	9 (6–11)	< 0.001	8 (5–11)	8 (5–10)	N.S.
Days before ICU^g	0 (0–2)	1 (0–5)	< 0.001	0 (0–2)	1 (0–3)	N.S.
Reasons for admission^h, n (%)
CNSⁱ	91 (22)	92 (20)	N.S.	58 (25)	57 (24)	N.S.
Hematologic	39 (9.6)	64 (14)	N.S.	26 (11)	27 (11)	N.S.
Gastric	88 (22)	148 (32)	< 0.001	51 (21)	74 (31)	0.02
Metabolic	82 (20)	95 (21)	N.S.	53 (22)	51 (21)	N.S.
Respiratory	188 (146)	239 (52)	N.S	111 (47)	130 (55)	N.S.
Cardiovascular	67 (17)	75 (16)	N.S.	35 (15)	41 (17)	N.S.
Hepatic	29 (7.2)	43 (9.4)	N.S.	22 (9.3)	22 (9.3)	N.S.
Renal	138 (34)	160 (35)	N.S.	89 (38)	93 (39)	N.S.
Other	42 (10)	34 (7.4)	N.S.	24 (10)	26 (11)	N.S.
Arrival route n (%)
Emergency department	115 (28)	93 (20)	0.007	64 (27)	54 (23)	N.S.
General ward	199 (49)	232 (51)	N.S.	128 (54)	120 (51)	N.S.
Intermediate care	7 (1.7)	19 (4.1)	0.046	3 (1.3)	11 (4.6)	N.S.
Operation	30 (7.4)	37 (8.0)	N.S.	21 (8.9)	22 (9.2)	N.S.
Other ICU	39 (9.6)	48 (10)	N.S.	20 (8.4)	29 (12)	N.S.
Other arrival route	15 (3.7)	30 (6.5)	N.S.	1 (0.42)	1 (0.42)	N.S.

^aRed blood cell transfusion
^bMann–Whitney or Chi-2 test
^cWilcoxon rank sum or McNemar´s test
^dSimplified acute physiology score 3
^eInterquartile range
^fSequential organ failure assessment
^gDays on hospital before admission to the intensive care unit
^hPatients may have more than one reason for admission
ⁱCentral nervous system

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