Table 1.

Difference in the clinical outcomes between the 2 groups

Variable	Favorable group (n = 48)	Unfavorable group (n = 34)	Difference	95% CI	p-value
VAS for back
Preoperation	5.55 ± 1.80	5.34 ± 1.78	0.21 ± 0.45	-0.790 to 1.419	0.579†
1 Week	2.73 ± 0.79	3.77 ± 1.36	-1.04 ± 0.47	-2.009 to 0.075	0.036†
1 Month	1.73 ± 0.90	4.00 ± 1.22	-2.27 ± 0.45	-3.200 to 1.346	< 0.001†
6 Months	2.36 ± 1.43	3.23 ± 1.36	0.87 ± 0.57	-2.053 to 0.319	0.144†
VAS for leg
Preoperation	5.72 ± 2.15	6.62 ± 1.04	0.89 ± 0.67	-2.283 to 0.506	0.200†
1 Week	2.82 ± 1.66	4.77 ± 1.53	-1.95 ± 0.65	-3.306 to 0.596	0.007†
1 Month	1.64 ± 1.43	5.69 ± 1.18	-4.056 ± 0.53	-5.162 to 2.649	< 0.001†
6 Months	2.27 ± 1.62	4.69 ± 1.80	-2.42 ± 0.70	-3.879 to 0.960	0.002†
Odom’s criteria, excellent:good:fair:poor
1 Week	10:32:6:0	0:8:24:2	-	-	< 0.001‡
1 Month	20:28:0:0	0:2:28:4	-	-	< 0.001‡
6 Months	16:32:0:0	0:0:30:4	-	-	< 0.001‡

Values are presented as mean±standard deviation or number.

CI, confidence interval; VAS, visual analogue scale.

^†Independent t-test.

^‡Pearson chi-square test.