Total (n=199)	VAS- Back <7 (n=84)	VAS- Back>=7 (n=115)	*p-value
Spinal Pathology
Central Stenosis		86.9% (173)	92.9% (78)	82.6% (95)	0.034
Foraminal Stenosis		38.2% (76)	46.4% (39)	32.2% (37)	0.041
Herniated Nucleus Pulposus		7.5% (15)	4.8% (4)	9.6% (11)	0.205
Degenerative Spondylolisthesis		50.8% (101)	47.6% (40)	53.0% (61)	0.450
Degenerative Scoliosis		32.2% (64)	36.9% (31)	28.7% (33)	0.221
Isthmic Spondylisthesis		10.1% (20)	15.5% (13)	6.1% (7)	0.080
Number of Operative Levels					0.242
Single Level		73.1% (144)	77.4% (65)	69.9% (79)
Multiple Levels		26.9% (53)	22.6% (19)	30.1% (34)
Operative Time (Mean±SD; min)		163.3 ± 90.5	156.8 ± 87.0	167.9± 93.0	0.395
Estimated Blood Loss (Mean±SD; mL)		96.8 ± 176.4	103.1 ± 250.8	92.0 ± 84.8	0.673
1-year arthrodesis		99.1% (112)	97.2% (36)	100.0% (75)	-
Length of Stay (Mean±SD; hours)		48.3 ± 35.1	40.6 ± 31.8	53.9 ± 36.3	0.011
Postoperative Day of Discharge (POD)
POD0		11.3% (21)	14.1% (11)	9.3% (10)	0.129
POD1		36.6% (68)	42.3% (33)	32.4% (35)
POD2		23.1% (43)	26.9% (21)	20.4% (22)
POD3		14.5% (27)	7.7% (6)	19.4% (21)
POD4		8.6% (16)	6.4% (5)	10.2% (11)
Postoperative VAS Pain Score
POD0		5.4 ± 1.9	4.8 ± 1.9	5.7 ± 1.9	0.008
POD1		4.8 ± 1.8	4.2 ± 1.3	5.1 ± 1.9	0.013
Postoperative Narcotic Consumption (OME)
POD0		61.2 ± 41.1	54.5 ± 32.5	66.0 ± 45.9	0.051
POD1		47.5 ± 47.6	39.7 ± 32.2	53.2 ± 55.7	0.049