Microdecompression versus Open Laminectomy and Posterior Stabilization for Multilevel Lumbar Spine Stenosis: A Randomized Controlled Trial

Table 5

The mean differences of ODI, VAS for back pain, and VAS for leg pain between preoperative and postoperative assessments three times.

Study variables	Periods of assessment	N	Mean	SD	Paired t-test	value
ODI	Preoperative ODI	50	72.24	2.38	84.07	<0.001
	1 month postoperative ODI	50	16.72	4.07
	Preoperative ODI	50	72.24	2.38	155.4	<0.001
	6 months postoperative ODI	50	12.90	1.26
	Preoperative ODI	50	72.24	2.38	179.73	<0.001
	12 months postoperative ODI	50	10.20	1.62
VAS for back pain	Preoperative VAS for back pain	50	5.14	0.90	11.28	<0.001
	1 month postoperative VAS for back pain	50	3.18	1.15
	Preoperative VAS for back pain	50	5.14	0.90	23.21	<0.001
	6 month postoperative VAS for back pain	50	1.68	0.84
	Preoperative VAS for back pain	50	5.14	0.90	32.99	<0.001
	12 month postoperative VAS for back pain	50	0.30	0.50
VAS for leg pain	Preoperative VAS for leg pain	50	9.86	0.35	77.65	<0.001
	1 month postoperative VAS for leg pain	50	1.86	0.78
	Preoperative VAS for leg pain	50	9.86	0.35	103.68	<0.001
	6 month postoperative VAS for leg pain	50	0.38	0.60
	Preoperative VAS for leg pain	50	9.86	0.35	128.21	<0.001
	12 month postoperative VAS for leg pain	50	0.14	0.45