Table 2.

Comparisons of surgical outcomes.

Group	Preoperative	Postoperative 3 months	Postoperative 6 months	Postoperative 12 months
Back pain VAS score
High PLVI (n = 169)	6.3 ± 0.4	3.2 ± 0.8	1.3 ± 1.2	0.5 ± 1.4
Low PLVI (n = 145)	6.7 ± 0.2	4.9 ± 1.2	2.5 ± 1.5	1.9 ± 0.7
P value	0.91	0.02	0.006	0.003
Leg pain VAS score
High PLVI (n = 169)	7.5 ± 1.9	2.5 ± 1.2	1.8 ± 1.3	0.5 ± 1.4
Low PLVI (n = 145)	7.7 ± 1.5	2.9 ± 1.6	2.2 ± 1.7	0.7 ± 1.2
P value	0.94	0.81	0.85	0.89
ODI score
High PLVI (n = 169)	66.8 ± 12.5	32.6 ± 10.9	20.7 ± 12.4	18.4 ± 13.5
Low PLVI (n = 145)	67.5 ± 15.3	42.7 ± 11.7	28.6 ± 13.2	24.5 ± 10.8
P value	0.95	0.01	0.04	0.02
EQ-5D score
High PLVI (n = 169)	0.52 ± 0.5	0.74 ± 0.2	0.82 ± 0.5	0.89 ± 0.7
Low PLVI (n = 145)	0.51 ± 0.3	0.62 ± 0.7	0.71 ± 0.4	0.81 ± 0.3
P value	0.93	0.04	0.03	0.04