Table 2.

Univariate analysis

Variable	Donors	Nondonors	p Value
Mean duration of surgery (minutes)	191	193	0.95
Mean number comorbidities	1.54	1.27	< 0.01
Mean number of levels operated	2.0	2.3	0.07
Mean blood loss (cc)	963	796	0.16
Mean blood replacement (cc)	1391	410	< 0.01
Mean preoperative hemoglobin (g/dL)	11.7	13.2	0.04
Mean postoperative hemoglobin (g/dL)	11.3	10.9	0.40
Mean age (years)	61.4	61.3	0.86
Mean BMI (kg/m2)	25.9	23.6	0.05