Table 3

Perioperative Data – Safety Population

	Patient Group
Variable	TDR	ACDF	p value^**
Duration of Hospitalization^*			0.9829
N	179	81
Mean (SD)	2.1 (0.52)	2.1 (0.47)
Blood Loss (ml)			0.9628
N	145	66
Mean (SD)	47.7 (46.75)	48.1 (55.21)
Operative Time (Hours)			0.0572
N	179	81
Mean (SD)	1.5 (0.64)	1.3 (0.63)

↵* Duration of hospitalization is defined as [Date of Discharge – Date of Surgery +1]
↵** Using unpaired t-test to make comparison across treatments