Table 3.

Comparison of functional outcomes between the two groups

	4S group	6S group	P value
VAS
Pre	7.62 ± 1.28	7.46 ± 1.05	0.552
1 month	3.24 ± 0.72*	3.56 ± 0.75*	0.062
6 months	2.46 ± 0.73*	2.38 ± 0.88*	0.668
Final	1.65 ± 0.68*	1.54 ± 0.60*	0.456
ODI
Pre	54.32 ± 9.55	55.64 ± 10.50	0.569
1 month	26.81 ± 5.88*	27.41 ± 5.96*	0.660
6 months	20.65 ± 3.43*	19.08 ± 4.49*	0.092
Final	18.86 ± 4.77*	18.23 ± 4.15*	0.540
Chronic low back pain	2	1	0.525

VAS Visual analogue scale, ODI Oswestry Disability Index, CLBP Chronic low back pain

1 month: one month after surgery, 6 months: six months after surgery, FINAL: final follow-up

*Statistically significant compared with the preoperative value, p < 0.05

Bold represents there is statistical significance between the groups, p < 0.05