Table 4.

Mean number of transfused units of blood products within the five strata

PS stratum	Observation mean (SD)	SAE mean (SD)	P value
Stratum 1	1.2 (1.3)	9.8 (18.9)	0.32*
Stratum 2	1.5 (3.1)	9.2 (15.4)	0.053*
Stratum 3	3.0 (5.7)	1.8 (2.1)	0.68*
Stratum 4	7.1 (13.8)	–	–
Stratum 5	3.2 (7.6)	–	–
Overall (conditional on the Ps)	4.4 (9.9)	9.1 (17.2)	0.75†

Data are presented as mean (SD)

Patients with the highest propensity score are located in stratum 1 and patients with the lowest propensity score in stratum 5

SAE splenic artery embolization

* Independent T test

^† P value was calculated with a linear model and covariate adjustment using the propensity score