Table 2.

Univariate and Multivariate Analysis of Factors Associated with Major Blood Loss During Adult Spinal Deformity surgery.

	Univariate Analysis		Multivariate Analysis
Characteristics	Odds Ratio	P Value	Odds Ratio	P Value
T-Score (lowest)	1.79 [1.05, 3.06]	.032	2.47 [1.03, 5.89]	.042
Age	1.01 [.97, 1.05]	.595	1.03 [.98, 1.09]	.288
Number of levels fused	.87 [.76, 1.02]	.085	.83 [.64, 1.00]	.046
3-Column osteotomy	.55 [.19, 1.55]	.256	.46 [.11, 1.93]	.288
Previous spine surgery	1.46 [.55, 3.87]	.446	1.04 [.23, 4.61]	.962
Preoperative platelet count	1.01 [1.00, 1.02]	.010	1.01 [1.00, 1.02]	.085
Taking medication for osteoporosis	.89 [.29, 2.69]	.832	2.63 [.39, 17.7]	.321

Significance was set to P < .05 for all statistical tests including those bolded in this table.