Table 4.

Determinants of intraoperative packed RBC transfusion.

Parameter	β Coefficient (95% CI)	P Value
Pelvic fixation	0.52 (0.02 to 0.03)	< .0001
ASA score	0.33 (0.01 to 0.07)	< .0001
Number of levels	0.09 (0.002 to 0.004)	< .0001
Age	0.007 (0.15 to 1.3)	.047
3-column osteotomy	0.73 (−1.5 to −0.5)	< .0001
Operative time	0.001	.007
TLIF	0.37	.007
History of hypertension	0.33	.02