Table 2.

Comparison of rates and total volume of transfusion between two groups

Outcome	Group	Crude			PS matching
		Event/n	OR (95% CI)	p-value	Event/n	OR (95% CI)	p-value
Rate of transfusion	Group I	8/45	0.949 (0.411, 2.190)	0.903a	8/45	0.754 (0.212, 2.686)	0.754b
	Group C	41/221			9/45
		Mean ± SD		p-value	Mean ± SD		p-value
Volume of transfusion (mL)	Group I	35.56 ± 77.33		0.602c	35.56 ± 77.33		0.791c
	Group C	43.44 ± 94.94			40.00 ± 80.90

PS propensity score

^ap-value by simple Logistic regression; ^bp-value by conditional Logistic regression with adjusted variables in Table 1, ^cp-value by student’s t test