The factors of deterioration in long-term clinical course of lumbar spinal canal stenosis after successful conservative treatment

Table 3 Logistic regression analysis of prognostic factors

Factor	Regression coefficient	Standard error	Odds ratio	p value	95% confidence interval
≤ 65 years or > 65 years	0.4954	0.6932	1.641	0.475	0.422–6.385
Clinical classification	0.7957	0.7122	2.216	0.264	0.549–8.950
Muscle weakness in lower limb	− 0.0176	0.7451	0.983	0.981	0.228–4.233
Intermittent claudication at the initial visit (severe)	1.8969	0.6817	6.665	0.005*	1.752–25.357
Vertebral body slip (3 mm or more)	− 0.5183	0.7214	0.596	0.473	0.145–2.449
Scoliosis (Cobb angle 10° or greater)	0.4510	0.9897	1.570	0.649	0.226–10.923
Block on myelography	0.8047	0.8126	2.236	0.322	0.455–10.994
Redundant nerve roots of cauda equina	− 0.4547	0.9992	0.635	0.649	0.090–4.498

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