Table 3.

Comparison of clinical and imaging data after two kinds of operation.

Scoring system	UBE (N = 42)	OLD (N = 40)	P-value
VAS
Preop (mean score)	5.59 ± 0.50	5.68 ± 0.62	0.591
Postop (1 week)	2.28 ± 0.59	2.85 ± 0.74	0.013*
Follow-up at 6 months	1.85 ± 0.35	1.70 ± 0.46	0.088
Follow-up at 1 years	1.73 ± 0.45	1.62 ± 0.49	0.271
p-value (pre vs.post)	<0.001**	<0.001**
ODI
Preop (mean score)	61.79 ± 3.31	62.33 ± 3.67	0.488
Postop (1 week)	36.28 ± 2.03	37.57 ± 1.98	0.005*
Follow-up at 6 months	22.73 ± 3.60	22.98 ± 3.57	0.099
Follow-up at 1 years	19.79 ± 2.80	19.65 ± 2.47	0.204
p-value (pre vs.post)	<0.001**	<0.001**
ZCQ
Preop (mean score)	66.00 ± 3.28	66.25 ± 3.47	0.783
Postop (1 week)	38.83 ± 4.38	39.08 ± 4.32	0.802
Follow-up at 6 months	22.74 ± 3.60	22.97 ± 3.57	0.766
Follow-up at 1 years	19.79 ± 2.79	19.65 ± 2.47	0.817
p-value (pre vs.post)	<0.001**	<0.001**
The changes of CSA before and after operation	0.69 ± 0.15	0.73 ± 0.16	0.096
The changes of PMA before and after operation	3.49 ± 3.03	5.58 ± 3.00	<0.001**

Values are presented as mean ± standard deviation. VAS, visual analogue scale; ODI, Oswestry Disability Index; ZCQ, Zurich Claudication Questionnaire; CSA, cross-sectional area; PMA, paravertebral Muscle area. *p < 0.05, **p < 0.001.