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

Table 4

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	71.30	1.69	94.57	<0.001
	1 month postoperative ODI	50	15.42	3.59
	Preoperative ODI	50	71.30	1.69	177.31	<0.001
	6 months postoperative ODI	50	12.68	1.44
	Preoperative ODI	50	71.30	1.69	237.4	<0.001
	12 months postoperative ODI	50	10.52	0.88
VAS for back pain	Preoperative VAS for back pain	50	5.22	0.70	19.66	<0.001
	1 month postoperative VAS for back pain	50	1.66	1.08
	Preoperative VAS for back pain	50	5.22	0.70	42.41	<0.001
	6 month postoperative VAS for back pain	50	0.66	0.55
	Preoperative VAS for back pain	50	5.22	0.70	56.58	<0.001
	12 month postoperative VAS for back pain	50	0.24	0.43
VAS for leg pain	Preoperative VAS for leg pain	50	9.86	0.35	71.28	<0.001
	1 month postoperative VAS for leg pain	50	1.64	0.80
	Preoperative VAS for leg pain	50	9.86	0.35	99.72	<0.001
	6 month postoperative VAS for leg pain	50	0.32	0.55
	Preoperative VAS for leg pain	50	9.86	0.35	178.92	<0.001
	12 month postoperative VAS for leg pain	50	0.04	0.19