Source and publication year	Year of study	Study design	No. of patient		Follow-up	Clinical evaluation based on VAS score, ODI score and JOA score.	Conclusion
Source and publication year	Year of study	Study design	CBT	PS	Follow-up		Conclusion
Lee, Son, Kim et al. (2015)	_	Prospective study	38	39	1 year	VAS score for the low back pain and radiating pain was decreased from 7.6 ± 3.1 and 5.7 ± 1.8 preoperatively to 2.0 ± 0.1 and 1.1 ± 0.4 postoperative in PS group and from 7.7 ± 3.1 and 5.9 ± 1.3 preoperatively to 2.1 ± 1.5 and 1.2 ± 0.6 at postoperative in CBT group (p = 0.38) for back pain and p = 0.67 for radiating pain). ODI score was decreased from 36.5 ± 10.1 and 35.1 ± 9.7 preoperatively to 11.0 ± 2.5 and 10.5 ± 2.8 postoperative in PS group and CBT group respectively (p = 0.46). But the VAS score for the low back pain at postoperative week one was 4.3 ± 2.1 for PS group and 2.4 ± 1.3 for CBT group (p = 0.02).	Both the ODI score and VAS score showed no significant difference between the two groups. However VAS score for low back pain at postoperative week 1 is significantly low in CBT group.
Sakura, Miwa, Yamashita et al. (2016)	Since Nov 2011 for CBT group and before Oct 2011 for PS group	Cohort study	95	82	35 months (CBT group) 40 months (PS group)	There was significant improvement in the JOA score from 13.7 preoperative to 23.3 postoperative final follow up in CBT group (mean recovery rate 64.4%) in comparison with 14.4 points before operation to 22.7 points at latest follow up in PS group (mean recovery rate 55.8%, p < 0.05).	There was no significant difference between the JOA score between two groups; however recovery rate is higher in CBT group.
Hung, Wu, Kao et al. (2016)	May 2013-Jan. 2014	Retrospective study	16	16	18 months	VAS score for the back pain and leg pain was 6.87 ± 1.26 and 7.60 ± 2.06 preoperative to 1.25 ± 0.96 and 0.05 ± 0.55 postoperative in CBT group and 6.67 ± 2.87 and 7.60 ± 2.06 preoperative to 1.08 ± 1.11 and 0.15 ± 0.55 postoperative follow up in PS group. ODI score was 31 ± 4.95 preoperative to 5.5 ± 1.71 postoperative follow up in CBT group and 26.16 ± 8.92 preoperative to 5.84 ± 4.43 postoperative follow up in PS group. The JOA score was 11 ± 4.24 to 27 ± 2.16 (recovery rate = 76.20%) in postoperative follow up in CBT group and 17.64 ± 8.30 to 25.77 ± 1.92 (recovery rate = 67.21%) in PS group.	The VAS Score for back and leg pain, ODI score and JOA score improved in both groups postoperatively but showed no significant difference between the two groups.
Lee and Ahn (2017)	_	Prospective randomized study	35	37	2 years	VAS score for low back pain and radiating pain decreased from 7.6 ± 3.1 and5.7 ± 1.8 preoperatively to 2.9 ± 1.1 and 1.8 ± 0.6 1 at 2 year postoperatively in PS group and from 7.7 ± 3.1 and 5.9 ± 1.3 to 2.7 ± 0.8 and 1.3 ± 0.7 in CBT group (p = 0.67 for back pain and p = 0.35 for radiating pain). The mean ODI score was also improved on both group from 36.5 ± 10.1 to 13.6 ± 4.9 at 2 year postoperatively in PS group and from 35.1 ± 9.7 preoperatively to 11.8 ± 6.2 at 2 years postoperatively in CBT group.	The VAS Score for back and leg pain as well as ODI score improved in both groups postoperatively but showed no significant difference between the two groups.